mirror of
https://github.com/glfw/glfw.git
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Renamed context module files.
This commit is contained in:
Camilla Berglund
+685
@@ -0,0 +1,685 @@
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//========================================================================
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// GLFW - An OpenGL library
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// Platform: Any
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// API version: 3.0
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// WWW: http://www.glfw.org/
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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||||
// freely, subject to the following restrictions:
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||||
//
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||||
// 1. The origin of this software must not be misrepresented; you must not
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||||
// claim that you wrote the original software. If you use this software
|
||||
// in a product, an acknowledgment in the product documentation would
|
||||
// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <stdio.h>
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//========================================================================
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// Parses the client API version string and extracts the version number
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//========================================================================
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static GLboolean parseGLVersion(int* api, int* major, int* minor, int* rev)
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{
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int i, _api = GLFW_OPENGL_API, _major, _minor = 0, _rev = 0;
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const char* version;
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const char* prefixes[] =
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{
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"OpenGL ES-CM ",
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"OpenGL ES-CL ",
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"OpenGL ES ",
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NULL
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};
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version = (const char*) glGetString(GL_VERSION);
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if (!version)
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{
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_glfwSetError(GLFW_PLATFORM_ERROR, "Failed to retrieve version string");
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return GL_FALSE;
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}
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for (i = 0; prefixes[i]; i++)
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{
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const size_t length = strlen(prefixes[i]);
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if (strncmp(version, prefixes[i], length) == 0)
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{
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version += length;
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_api = GLFW_OPENGL_ES_API;
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break;
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}
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}
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if (!sscanf(version, "%d.%d.%d", &_major, &_minor, &_rev))
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{
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_glfwSetError(GLFW_PLATFORM_ERROR, "No version found in version string");
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return GL_FALSE;
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}
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*api = _api;
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*major = _major;
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*minor = _minor;
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*rev = _rev;
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return GL_TRUE;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Return the available framebuffer config closest to the desired values
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// This is based on the manual GLX Visual selection from 2.6
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//========================================================================
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const _GLFWfbconfig* _glfwChooseFBConfig(const _GLFWfbconfig* desired,
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const _GLFWfbconfig* alternatives,
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unsigned int count)
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{
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unsigned int i;
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unsigned int missing, leastMissing = UINT_MAX;
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unsigned int colorDiff, leastColorDiff = UINT_MAX;
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unsigned int extraDiff, leastExtraDiff = UINT_MAX;
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const _GLFWfbconfig* current;
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const _GLFWfbconfig* closest = NULL;
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for (i = 0; i < count; i++)
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{
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current = alternatives + i;
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if (desired->stereo > 0 && current->stereo == 0)
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{
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// Stereo is a hard constraint
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continue;
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}
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// Count number of missing buffers
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{
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missing = 0;
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if (desired->alphaBits > 0 && current->alphaBits == 0)
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missing++;
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if (desired->depthBits > 0 && current->depthBits == 0)
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missing++;
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if (desired->stencilBits > 0 && current->stencilBits == 0)
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missing++;
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if (desired->auxBuffers > 0 && current->auxBuffers < desired->auxBuffers)
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missing += desired->auxBuffers - current->auxBuffers;
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if (desired->samples > 0 && current->samples == 0)
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{
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// Technically, several multisampling buffers could be
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// involved, but that's a lower level implementation detail and
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// not important to us here, so we count them as one
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missing++;
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}
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}
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// These polynomials make many small channel size differences matter
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// less than one large channel size difference
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// Calculate color channel size difference value
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{
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colorDiff = 0;
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if (desired->redBits > 0)
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{
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colorDiff += (desired->redBits - current->redBits) *
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(desired->redBits - current->redBits);
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}
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if (desired->greenBits > 0)
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{
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colorDiff += (desired->greenBits - current->greenBits) *
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(desired->greenBits - current->greenBits);
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}
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if (desired->blueBits > 0)
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{
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colorDiff += (desired->blueBits - current->blueBits) *
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(desired->blueBits - current->blueBits);
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}
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}
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// Calculate non-color channel size difference value
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{
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extraDiff = 0;
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if (desired->alphaBits > 0)
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{
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extraDiff += (desired->alphaBits - current->alphaBits) *
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(desired->alphaBits - current->alphaBits);
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}
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if (desired->depthBits > 0)
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{
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extraDiff += (desired->depthBits - current->depthBits) *
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(desired->depthBits - current->depthBits);
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}
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if (desired->stencilBits > 0)
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{
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extraDiff += (desired->stencilBits - current->stencilBits) *
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(desired->stencilBits - current->stencilBits);
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}
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if (desired->accumRedBits > 0)
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{
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extraDiff += (desired->accumRedBits - current->accumRedBits) *
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(desired->accumRedBits - current->accumRedBits);
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}
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if (desired->accumGreenBits > 0)
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{
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extraDiff += (desired->accumGreenBits - current->accumGreenBits) *
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(desired->accumGreenBits - current->accumGreenBits);
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}
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if (desired->accumBlueBits > 0)
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{
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extraDiff += (desired->accumBlueBits - current->accumBlueBits) *
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(desired->accumBlueBits - current->accumBlueBits);
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}
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if (desired->accumAlphaBits > 0)
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{
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extraDiff += (desired->accumAlphaBits - current->accumAlphaBits) *
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(desired->accumAlphaBits - current->accumAlphaBits);
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}
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if (desired->samples > 0)
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{
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extraDiff += (desired->samples - current->samples) *
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(desired->samples - current->samples);
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}
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}
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// Figure out if the current one is better than the best one found so far
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// Least number of missing buffers is the most important heuristic,
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// then color buffer size match and lastly size match for other buffers
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if (missing < leastMissing)
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closest = current;
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else if (missing == leastMissing)
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{
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if ((colorDiff < leastColorDiff) ||
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(colorDiff == leastColorDiff && extraDiff < leastExtraDiff))
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{
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closest = current;
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}
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}
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if (current == closest)
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{
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leastMissing = missing;
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leastColorDiff = colorDiff;
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leastExtraDiff = extraDiff;
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}
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}
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return closest;
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}
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//========================================================================
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// Checks whether the client API part of the window config is sane
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// It blames glfwOpenWindow because that's the only caller
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//========================================================================
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GLboolean _glfwIsValidContextConfig(_GLFWwndconfig* wndconfig)
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{
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if (wndconfig->clientAPI != GLFW_OPENGL_API &&
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wndconfig->clientAPI != GLFW_OPENGL_ES_API)
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{
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_glfwSetError(GLFW_INVALID_ENUM,
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"glfwCreateWindow: Invalid client API requested");
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return GL_FALSE;
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}
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if (wndconfig->clientAPI == GLFW_OPENGL_API)
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{
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if (wndconfig->glMajor < 1 || wndconfig->glMinor < 0)
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{
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// OpenGL 1.0 is the smallest valid version
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Invalid OpenGL version requested");
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return GL_FALSE;
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}
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if (wndconfig->glMajor == 1 && wndconfig->glMinor > 5)
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{
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// OpenGL 1.x series ended with version 1.5
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Invalid OpenGL version requested");
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return GL_FALSE;
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}
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else if (wndconfig->glMajor == 2 && wndconfig->glMinor > 1)
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{
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// OpenGL 2.x series ended with version 2.1
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Invalid OpenGL version requested");
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return GL_FALSE;
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}
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else if (wndconfig->glMajor == 3 && wndconfig->glMinor > 3)
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{
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// OpenGL 3.x series ended with version 3.3
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Invalid OpenGL version requested");
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return GL_FALSE;
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}
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else
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{
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// For now, let everything else through
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}
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if (wndconfig->glProfile)
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{
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if (wndconfig->glProfile != GLFW_OPENGL_CORE_PROFILE &&
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wndconfig->glProfile != GLFW_OPENGL_COMPAT_PROFILE)
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{
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_glfwSetError(GLFW_INVALID_ENUM,
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"glfwCreateWindow: Invalid OpenGL profile requested");
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return GL_FALSE;
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}
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if (wndconfig->glMajor < 3 ||
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(wndconfig->glMajor == 3 && wndconfig->glMinor < 2))
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{
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// Desktop OpenGL context profiles are only defined for version 3.2
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// and above
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Context profiles only exist for "
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"OpenGL version 3.2 and above");
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return GL_FALSE;
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}
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}
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if (wndconfig->glForward && wndconfig->glMajor < 3)
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{
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// Forward-compatible contexts are only defined for OpenGL version 3.0 and above
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwCreateWindow: Forward compatibility only exist "
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"for OpenGL version 3.0 and above");
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return GL_FALSE;
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}
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}
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else if (wndconfig->clientAPI == GLFW_OPENGL_ES_API)
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{
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if (wndconfig->glMajor < 1 || wndconfig->glMinor < 0)
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{
|
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// OpenGL ES 1.0 is the smallest valid version
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_glfwSetError(GLFW_INVALID_VALUE,
|
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"glfwCreateWindow: Invalid OpenGL ES version requested");
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return GL_FALSE;
|
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}
|
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if (wndconfig->glMajor == 1 && wndconfig->glMinor > 1)
|
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{
|
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// OpenGL ES 1.x series ended with version 1.1
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_glfwSetError(GLFW_INVALID_VALUE,
|
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"glfwCreateWindow: Invalid OpenGL ES version requested");
|
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return GL_FALSE;
|
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}
|
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else
|
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{
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// For now, let everything else through
|
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}
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if (wndconfig->glProfile)
|
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{
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// OpenGL ES does not support profiles
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_glfwSetError(GLFW_INVALID_VALUE,
|
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"glfwCreateWindow: Context profiles are not supported "
|
||||
"by OpenGL ES");
|
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return GL_FALSE;
|
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}
|
||||
|
||||
if (wndconfig->glForward)
|
||||
{
|
||||
// OpenGL ES does not support forward-compatibility
|
||||
_glfwSetError(GLFW_INVALID_VALUE,
|
||||
"glfwCreateWindow: Forward compatibility is not "
|
||||
"supported by OpenGL ES");
|
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return GL_FALSE;
|
||||
}
|
||||
}
|
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|
||||
if (wndconfig->glRobustness)
|
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{
|
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if (wndconfig->glRobustness != GLFW_OPENGL_NO_RESET_NOTIFICATION &&
|
||||
wndconfig->glRobustness != GLFW_OPENGL_LOSE_CONTEXT_ON_RESET)
|
||||
{
|
||||
_glfwSetError(GLFW_INVALID_VALUE,
|
||||
"glfwCreateWindow: Invalid OpenGL robustness mode "
|
||||
"requested");
|
||||
return GL_FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
return GL_TRUE;
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Reads back context properties
|
||||
// It blames glfwCreateWindow because that's the only caller
|
||||
//========================================================================
|
||||
|
||||
GLboolean _glfwRefreshContextParams(void)
|
||||
{
|
||||
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
|
||||
|
||||
if (!parseGLVersion(&window->clientAPI,
|
||||
&window->glMajor,
|
||||
&window->glMinor,
|
||||
&window->glRevision))
|
||||
{
|
||||
return GL_FALSE;
|
||||
}
|
||||
|
||||
if (window->glMajor > 2)
|
||||
{
|
||||
// OpenGL 3.0+ uses a different function for extension string retrieval
|
||||
// We cache it here instead of in glfwExtensionSupported mostly to alert
|
||||
// users as early as possible that their build may be broken
|
||||
|
||||
window->GetStringi = (PFNGLGETSTRINGIPROC) glfwGetProcAddress("glGetStringi");
|
||||
if (!window->GetStringi)
|
||||
{
|
||||
_glfwSetError(GLFW_PLATFORM_ERROR,
|
||||
"glfwCreateWindow: Entry point retrieval is broken");
|
||||
return GL_FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
// Read back forward-compatibility flag
|
||||
{
|
||||
window->glForward = GL_FALSE;
|
||||
|
||||
if (window->clientAPI == GLFW_OPENGL_API && window->glMajor >= 3)
|
||||
{
|
||||
GLint flags;
|
||||
glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
|
||||
|
||||
if (flags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
|
||||
window->glForward = GL_TRUE;
|
||||
if (flags & 0)
|
||||
window->glDebug = GL_TRUE;
|
||||
}
|
||||
}
|
||||
|
||||
// Read back OpenGL context profile
|
||||
{
|
||||
window->glProfile = 0;
|
||||
|
||||
if (window->glMajor > 3 || (window->glMajor == 3 && window->glMinor >= 2))
|
||||
{
|
||||
GLint mask;
|
||||
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
|
||||
|
||||
if (mask & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
|
||||
window->glProfile = GLFW_OPENGL_COMPAT_PROFILE;
|
||||
else if (mask & GL_CONTEXT_CORE_PROFILE_BIT)
|
||||
window->glProfile = GLFW_OPENGL_CORE_PROFILE;
|
||||
}
|
||||
}
|
||||
|
||||
return GL_TRUE;
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Checks whether the current context fulfils the specified requirements
|
||||
// It blames glfwCreateWindow because that's the only caller
|
||||
//========================================================================
|
||||
|
||||
GLboolean _glfwIsValidContext(_GLFWwndconfig* wndconfig)
|
||||
{
|
||||
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
|
||||
|
||||
if (window->glMajor < wndconfig->glMajor ||
|
||||
(window->glMajor == wndconfig->glMajor &&
|
||||
window->glMinor < wndconfig->glMinor))
|
||||
{
|
||||
// The desired OpenGL version is greater than the actual version
|
||||
// This only happens if the machine lacks {GLX|WGL}_ARB_create_context
|
||||
// /and/ the user has requested an OpenGL version greater than 1.0
|
||||
|
||||
// For API consistency, we emulate the behavior of the
|
||||
// {GLX|WGL}_ARB_create_context extension and fail here
|
||||
|
||||
_glfwSetError(GLFW_VERSION_UNAVAILABLE,
|
||||
"glfwCreateWindow: The requested OpenGL version is not available");
|
||||
return GL_FALSE;
|
||||
}
|
||||
|
||||
return GL_TRUE;
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Check if a string can be found in a client API extension string
|
||||
//========================================================================
|
||||
|
||||
int _glfwStringInExtensionString(const char* string,
|
||||
const GLubyte* extensions)
|
||||
{
|
||||
const GLubyte* start;
|
||||
GLubyte* where;
|
||||
GLubyte* terminator;
|
||||
|
||||
// It takes a bit of care to be fool-proof about parsing the
|
||||
// OpenGL extensions string. Don't be fooled by sub-strings,
|
||||
// etc.
|
||||
start = extensions;
|
||||
for (;;)
|
||||
{
|
||||
where = (GLubyte*) strstr((const char*) start, string);
|
||||
if (!where)
|
||||
return GL_FALSE;
|
||||
|
||||
terminator = where + strlen(string);
|
||||
if (where == start || *(where - 1) == ' ')
|
||||
{
|
||||
if (*terminator == ' ' || *terminator == '\0')
|
||||
break;
|
||||
}
|
||||
|
||||
start = terminator;
|
||||
}
|
||||
|
||||
return GL_TRUE;
|
||||
}
|
||||
|
||||
|
||||
//////////////////////////////////////////////////////////////////////////
|
||||
////// GLFW public API //////
|
||||
//////////////////////////////////////////////////////////////////////////
|
||||
|
||||
//========================================================================
|
||||
// Make the context associated with the specified window current
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI void glfwMakeContextCurrent(GLFWwindow handle)
|
||||
{
|
||||
_GLFWwindow* window = (_GLFWwindow*) handle;
|
||||
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return;
|
||||
}
|
||||
|
||||
if (_glfwPlatformGetCurrentContext() == window)
|
||||
return;
|
||||
|
||||
_glfwPlatformMakeContextCurrent(window);
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Returns the window whose context is current
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI GLFWwindow glfwGetCurrentContext(void)
|
||||
{
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return _glfwPlatformGetCurrentContext();
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Swap buffers (double-buffering)
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI void glfwSwapBuffers(GLFWwindow handle)
|
||||
{
|
||||
_GLFWwindow* window = (_GLFWwindow*) handle;
|
||||
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return;
|
||||
}
|
||||
|
||||
_glfwPlatformSwapBuffers(window);
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Set double buffering swap interval (0 = vsync off)
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI void glfwSwapInterval(int interval)
|
||||
{
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return;
|
||||
}
|
||||
|
||||
if (!_glfwPlatformGetCurrentContext())
|
||||
{
|
||||
_glfwSetError(GLFW_NO_CURRENT_CONTEXT, NULL);
|
||||
return;
|
||||
}
|
||||
|
||||
_glfwPlatformSwapInterval(interval);
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Check if a client API extension is available at runtime
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI int glfwExtensionSupported(const char* extension)
|
||||
{
|
||||
const GLubyte* extensions;
|
||||
_GLFWwindow* window;
|
||||
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return GL_FALSE;
|
||||
}
|
||||
|
||||
window = _glfwPlatformGetCurrentContext();
|
||||
if (!window)
|
||||
{
|
||||
_glfwSetError(GLFW_NO_CURRENT_CONTEXT, NULL);
|
||||
return GL_FALSE;
|
||||
}
|
||||
|
||||
if (extension == NULL || *extension == '\0')
|
||||
{
|
||||
_glfwSetError(GLFW_INVALID_VALUE, NULL);
|
||||
return GL_FALSE;
|
||||
}
|
||||
|
||||
if (window->glMajor < 3)
|
||||
{
|
||||
// Check if extension is in the old style OpenGL extensions string
|
||||
|
||||
extensions = glGetString(GL_EXTENSIONS);
|
||||
if (extensions != NULL)
|
||||
{
|
||||
if (_glfwStringInExtensionString(extension, extensions))
|
||||
return GL_TRUE;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
int i;
|
||||
GLint count;
|
||||
|
||||
// Check if extension is in the modern OpenGL extensions string list
|
||||
|
||||
glGetIntegerv(GL_NUM_EXTENSIONS, &count);
|
||||
|
||||
for (i = 0; i < count; i++)
|
||||
{
|
||||
if (strcmp((const char*) window->GetStringi(GL_EXTENSIONS, i),
|
||||
extension) == 0)
|
||||
{
|
||||
return GL_TRUE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Check if extension is in the platform-specific string
|
||||
return _glfwPlatformExtensionSupported(extension);
|
||||
}
|
||||
|
||||
|
||||
//========================================================================
|
||||
// Get the function pointer to a client API function
|
||||
// This can be used to get access to client API extension functions
|
||||
//========================================================================
|
||||
|
||||
GLFWAPI GLFWglproc glfwGetProcAddress(const char* procname)
|
||||
{
|
||||
if (!_glfwInitialized)
|
||||
{
|
||||
_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (!_glfwPlatformGetCurrentContext())
|
||||
{
|
||||
_glfwSetError(GLFW_NO_CURRENT_CONTEXT, NULL);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return _glfwPlatformGetProcAddress(procname);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user