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// gdraw_wgl.c - copyright 2011-2012 RAD Game Tools
//
// This implements the Iggy graphics driver layer for GL on Windows.
#define GDRAW_ASSERTS
#include "iggy.h"
#include "gdraw.h"
#include "gdraw_wgl.h"
#include <windows.h>
#include <gl/gl.h>
#include "glext.h"
#include <string.h>
#include <math.h>
#define true 1
#define false 0
///////////////////////////////////////////////////////////////////////////////
//
// Extensions (we map to GL 2.0 function names for a uniform interface
// across platforms)
//
#define GDRAW_GL_EXTENSION_LIST \
/* identifier import procname */ \
/* GL_ARB_multitexture */ \
GLE(ActiveTexture, "ActiveTextureARB", ACTIVETEXTUREARB) \
/* GL_ARB_texture_compression */ \
GLE(CompressedTexImage2D, "CompressedTexImage2DARB", COMPRESSEDTEXIMAGE2DARB) \
/* GL_ARB_vertex_buffer_object */ \
GLE(GenBuffers, "GenBuffersARB", GENBUFFERSARB) \
GLE(DeleteBuffers, "DeleteBuffersARB", DELETEBUFFERSARB) \
GLE(BindBuffer, "BindBufferARB", BINDBUFFERARB) \
GLE(BufferData, "BufferDataARB", BUFFERDATAARB) \
GLE(MapBuffer, "MapBufferARB", MAPBUFFERARB) \
GLE(UnmapBuffer, "UnmapBufferARB", UNMAPBUFFERARB) \
GLE(VertexAttribPointer, "VertexAttribPointerARB", VERTEXATTRIBPOINTERARB) \
GLE(EnableVertexAttribArray, "EnableVertexAttribArrayARB", ENABLEVERTEXATTRIBARRAYARB) \
GLE(DisableVertexAttribArray, "DisableVertexAttribArrayARB", DISABLEVERTEXATTRIBARRAYARB) \
/* GL_ARB_shader_objects */ \
GLE(CreateShader, "CreateShaderObjectARB", CREATESHADEROBJECTARB) \
GLE(DeleteShader, "DeleteObjectARB", DELETEOBJECTARB) \
GLE(ShaderSource, "ShaderSourceARB", SHADERSOURCEARB) \
GLE(CompileShader, "CompileShaderARB", COMPILESHADERARB) \
GLE(GetShaderiv, "GetObjectParameterivARB", GETOBJECTPARAMETERIVARB) \
GLE(GetShaderInfoLog, "GetInfoLogARB", GETINFOLOGARB) \
GLE(CreateProgram, "CreateProgramObjectARB", CREATEPROGRAMOBJECTARB) \
GLE(DeleteProgram, "DeleteObjectARB", DELETEOBJECTARB) \
GLE(AttachShader, "AttachObjectARB", ATTACHOBJECTARB) \
GLE(LinkProgram, "LinkProgramARB", LINKPROGRAMARB) \
GLE(GetUniformLocation, "GetUniformLocationARB", GETUNIFORMLOCATIONARB) \
GLE(UseProgram, "UseProgramObjectARB", USEPROGRAMOBJECTARB) \
GLE(GetProgramiv, "GetObjectParameterivARB", GETOBJECTPARAMETERIVARB) \
GLE(GetProgramInfoLog, "GetInfoLogARB", GETINFOLOGARB) \
GLE(Uniform1i, "Uniform1iARB", UNIFORM1IARB) \
GLE(Uniform4f, "Uniform4fARB", UNIFORM4FARB) \
GLE(Uniform4fv, "Uniform4fvARB", UNIFORM4FVARB) \
/* GL_ARB_vertex_shader */ \
GLE(BindAttribLocation, "BindAttribLocationARB", BINDATTRIBLOCATIONARB) \
/* GL_EXT_framebuffer_object */ \
GLE(GenRenderbuffers, "GenRenderbuffersEXT", GENRENDERBUFFERSEXT) \
GLE(DeleteRenderbuffers, "DeleteRenderbuffersEXT", DELETERENDERBUFFERSEXT) \
GLE(BindRenderbuffer, "BindRenderbufferEXT", BINDRENDERBUFFEREXT) \
GLE(RenderbufferStorage, "RenderbufferStorageEXT", RENDERBUFFERSTORAGEEXT) \
GLE(GenFramebuffers, "GenFramebuffersEXT", GENFRAMEBUFFERSEXT) \
GLE(DeleteFramebuffers, "DeleteFramebuffersEXT", DELETEFRAMEBUFFERSEXT) \
GLE(BindFramebuffer, "BindFramebufferEXT", BINDFRAMEBUFFEREXT) \
GLE(CheckFramebufferStatus, "CheckFramebufferStatusEXT", CHECKFRAMEBUFFERSTATUSEXT) \
GLE(FramebufferRenderbuffer, "FramebufferRenderbufferEXT", FRAMEBUFFERRENDERBUFFEREXT) \
GLE(FramebufferTexture2D, "FramebufferTexture2DEXT", FRAMEBUFFERTEXTURE2DEXT) \
GLE(GenerateMipmap, "GenerateMipmapEXT", GENERATEMIPMAPEXT) \
/* GL_EXT_framebuffer_blit */ \
GLE(BlitFramebuffer, "BlitFramebufferEXT", BLITFRAMEBUFFEREXT) \
/* GL_EXT_framebuffer_multisample */ \
GLE(RenderbufferStorageMultisample, "RenderbufferStorageMultisampleEXT",RENDERBUFFERSTORAGEMULTISAMPLEEXT) \
/* <end> */
#define gdraw_GLx_(id) gdraw_GL_##id
#define GDRAW_GLx_(id) GDRAW_GL_##id
#define GDRAW_SHADERS "gdraw_gl_shaders.inl"
typedef GLhandleARB GLhandle;
typedef gdraw_gl_resourcetype gdraw_resourcetype;
// Extensions
#define GLE(id, import, procname) static PFNGL##procname##PROC gl##id;
GDRAW_GL_EXTENSION_LIST
#undef GLE
static void load_extensions(void)
{
#define GLE(id, import, procname) gl##id = (PFNGL##procname##PROC) wglGetProcAddress("gl" import);
GDRAW_GL_EXTENSION_LIST
#undef GLE
}
static void clear_renderstate_platform_specific(void)
{
glDisable(GL_ALPHA_TEST);
}
static void error_msg_platform_specific(const char *msg)
{
OutputDebugStringA(msg);
}
///////////////////////////////////////////////////////////////////////////////
//
// Shared code
//
#define GDRAW_MULTISAMPLING
#include "gdraw_gl_shared.inl"
///////////////////////////////////////////////////////////////////////////////
//
// Initialization and platform-specific functionality
//
GDrawFunctions *gdraw_GL_CreateContext(S32 w, S32 h, S32 msaa_samples)
{
static const TextureFormatDesc tex_formats[] = {
{ IFT_FORMAT_rgba_8888, 1, 1, 4, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_rgba_4444_LE, 1, 1, 2, GL_RGBA4, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4 },
{ IFT_FORMAT_rgba_5551_LE, 1, 1, 2, GL_RGB5_A1, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1 },
{ IFT_FORMAT_la_88, 1, 1, 2, GL_LUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_la_44, 1, 1, 1, GL_LUMINANCE4_ALPHA4, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_i_8, 1, 1, 1, GL_INTENSITY8, GL_ALPHA, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_i_4, 1, 1, 1, GL_INTENSITY4, GL_ALPHA, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_l_8, 1, 1, 1, GL_LUMINANCE8, GL_LUMINANCE, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_l_4, 1, 1, 1, GL_LUMINANCE4, GL_LUMINANCE, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_DXT1, 4, 4, 8, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 0, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_DXT3, 4, 4, 16, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, 0, GL_UNSIGNED_BYTE },
{ IFT_FORMAT_DXT5, 4, 4, 16, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 0, GL_UNSIGNED_BYTE },
{ 0, 0, 0, 0, 0, 0, 0 },
};
GDrawFunctions *funcs;
const char *s;
GLint n;
// check for the extensions we need
s = (const char *) glGetString(GL_EXTENSIONS);
if (s == NULL) {
assert(s != NULL); // if this is NULL, you're probably trying to create the device too early
return NULL;
}
// check for the extensions we won't work without
if (!hasext(s, "GL_ARB_multitexture") ||
!hasext(s, "GL_ARB_texture_compression") ||
!hasext(s, "GL_ARB_texture_mirrored_repeat") ||
!hasext(s, "GL_ARB_texture_non_power_of_two") || // with caveats - see below!
!hasext(s, "GL_ARB_vertex_buffer_object") ||
!hasext(s, "GL_EXT_framebuffer_object") ||
!hasext(s, "GL_ARB_shader_objects") ||
!hasext(s, "GL_ARB_vertex_shader") ||
!hasext(s, "GL_ARB_fragment_shader"))
return NULL;
// if user requests multisampling and HW doesn't support it, bail
if (!hasext(s, "GL_EXT_framebuffer_multisample") && msaa_samples > 1)
return NULL;
load_extensions();
funcs = create_context(w, h);
if (!funcs)
return NULL;
gdraw->tex_formats = tex_formats;
// check for optional extensions
gdraw->has_mapbuffer = true; // part of core VBO extension on regular GL
gdraw->has_depth24 = true; // we just assume.
gdraw->has_texture_max_level = true; // core on regular GL
if (hasext(s, "GL_EXT_packed_depth_stencil")) gdraw->has_packed_depth_stencil = true;
// we require ARB_texture_non_power_of_two - on actual HW, this may either give us
// "full" non-power-of-two support, or "conditional" non-power-of-two (wrap mode must
// be CLAMP_TO_EDGE, no mipmaps). figure out which it is using this heuristic by
// Unity's Aras Pranckevicius (thanks!):
// http://www.aras-p.info/blog/2012/10/17/non-power-of-two-textures/
//
// we use the second heuristic (texture size <8192 for cards without full NPOT support)
// since we don't otherwise use ARB_fragment_program and don't want to create a program
// just to be able to query MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB!
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &n);
gdraw->has_conditional_non_power_of_two = n < 8192;
// clamp number of multisampling levels to max supported
if (msaa_samples > 1) {
glGetIntegerv(GL_MAX_SAMPLES, &n);
gdraw->multisampling = RR_MIN(msaa_samples, n);
}
opengl_check();
return funcs;
}
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