forked from 0ad/0ad
prefect
a92e92cd46
Remove a redundant copy operation in ModelRData::BuildVertices This was SVN commit r2822.
479 lines
14 KiB
C++
Executable File
479 lines
14 KiB
C++
Executable File
// OpenGL helpers
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//
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// Copyright (c) 2002-2005 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#include "precompiled.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include "lib.h"
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#include "sdl.h"
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#include "ogl.h"
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#include "detect.h"
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#include "debug.h"
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#include "lib/res/h_mgr.h"
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#include "lib/res/graphics/tex.h"
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#if MSC_VERSION
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#pragma comment(lib, "opengl32.lib")
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#pragma comment(lib, "glu32.lib")
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// glu32 is required - it is apparently pulled in by opengl32,
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// even though depends.exe marks it as demand-loaded.
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#endif
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//----------------------------------------------------------------------------
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// extensions
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//----------------------------------------------------------------------------
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// define extension function pointers
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extern "C"
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{
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#define FUNC(ret, name, params) ret (CALL_CONV *name) params;
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#define FUNC2(ret, nameARB, nameCore, version, params) ret (CALL_CONV *nameARB) params;
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#include "glext_funcs.h"
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#undef FUNC2
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#undef FUNC
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}
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static const char* exts = NULL;
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static bool have_20, have_14, have_13, have_12;
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// return a C string of unspecified length containing a space-separated
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// list of all extensions the OpenGL implementation advertises.
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// (useful for crash logs).
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const char* oglExtList()
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{
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debug_assert(exts && "call oglInit before using this function");
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return exts;
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}
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// paranoia: newer drivers may forget to advertise an extension
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// indicating support for something that has been folded into the core.
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// we therefore check for all extensions known to be offered by the
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// GL implementation present on the user's system; oglHaveExtension will
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// take this into account.
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// the app can therefore just ask for extensions and not worry about this.
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static bool isImplementedInCore(const char* ext)
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{
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#define MATCH(known_ext)\
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if(!strcmp(ext, #known_ext))\
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return true;
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if(have_20)
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{
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MATCH(GL_ARB_shader_objects);
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MATCH(GL_ARB_vertex_shader);
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MATCH(GL_ARB_fragment_shader);
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MATCH(GL_ARB_draw_buffers);
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MATCH(GL_ARB_texture_non_power_of_two);
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MATCH(GL_ARB_point_sprite);
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}
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if(have_14)
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{
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MATCH(GL_SGIS_generate_mipmap);
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MATCH(GL_NV_blend_square);
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MATCH(GL_ARB_depth_texture);
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MATCH(GL_ARB_shadow);
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MATCH(GL_EXT_fog_coord);
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MATCH(GL_EXT_multi_draw_arrays);
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MATCH(GL_ARB_point_parameters);
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MATCH(GL_EXT_secondary_color);
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MATCH(GL_EXT_blend_func_separate);
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MATCH(GL_EXT_stencil_wrap);
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MATCH(GL_ARB_texture_env_crossbar);
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MATCH(GL_EXT_texture_lod_bias);
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MATCH(GL_ARB_texture_mirrored_repeat);
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MATCH(GL_ARB_window_pos);
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}
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if(have_13)
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{
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MATCH(GL_ARB_texture_compression);
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MATCH(GL_ARB_texture_cube_map);
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MATCH(GL_ARB_multisample);
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MATCH(GL_ARB_multitexture);
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MATCH(GL_ARB_transpose_matrix);
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MATCH(GL_ARB_texture_env_add);
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MATCH(GL_ARB_texture_env_combine);
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MATCH(GL_ARB_texture_env_dot3);
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MATCH(GL_ARB_texture_border_clamp);
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}
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if(have_12)
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{
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MATCH(GL_EXT_texture3d);
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MATCH(GL_EXT_bgra);
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MATCH(GL_EXT_packed_pixels);
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MATCH(GL_EXT_rescale_normal);
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MATCH(GL_EXT_separate_specular_color);
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MATCH(GL_SGIS_texture_edge_clamp);
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MATCH(GL_SGIS_texture_lod);
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MATCH(GL_EXT_draw_range_elements);
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}
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#undef MATCH
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return false;
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}
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// check if the extension <ext> is supported by the OpenGL implementation.
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// takes subsequently added core support for some extensions into account.
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bool oglHaveExtension(const char* ext)
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{
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debug_assert(exts && "call oglInit before using this function");
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if(isImplementedInCore(ext))
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return true;
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const char *p = exts, *end;
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// make sure ext is valid & doesn't contain spaces
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if(!ext || ext == '\0' || strchr(ext, ' '))
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return false;
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for(;;)
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{
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p = strstr(p, ext);
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if(!p)
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return false; // <ext> string not found - extension not supported
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end = p + strlen(ext); // end of current substring
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// make sure the substring found is an entire extension string,
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// i.e. it starts and ends with ' '
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if((p == exts || p[-1] == ' ') && // valid start AND
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(*end == ' ' || *end == '\0')) // valid end
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return true;
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p = end;
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}
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}
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// check if the OpenGL implementation is at least at <version>.
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// (format: "%d.%d" major minor)
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bool oglHaveVersion(const char* desired_version)
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{
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int desired_major, desired_minor;
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if(sscanf(desired_version, "%d.%d", &desired_major, &desired_minor) != 2)
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{
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debug_warn("oglHaveVersion: invalid version string");
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return false;
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}
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int major, minor;
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const char* version = (const char*)glGetString(GL_VERSION);
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if(!version || sscanf(version, "%d.%d", &major, &minor) != 2)
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{
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debug_warn("oglHaveVersion: GL_VERSION invalid");
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return false;
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}
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return (major > desired_major) ||
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(major == desired_major && minor >= desired_minor);
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}
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// check if all given extension strings (passed as const char* parameters,
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// terminated by a 0 pointer) are supported by the OpenGL implementation,
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// as determined by oglHaveExtension.
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// returns 0 if all are present; otherwise, the first extension in the
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// list that's not supported (useful for reporting errors).
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//
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// note: dummy parameter is necessary to access parameter va_list.
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//
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//
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// rationale: this interface is more convenient than individual
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// oglHaveExtension calls and allows reporting which extension is missing.
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//
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// one disadvantage is that there is no way to indicate that either one
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// of 2 extensions would be acceptable, e.g. (ARB|EXT)_texture_env_dot3.
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// this is isn't so bad, since they wouldn't be named differently
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// if there weren't non-trivial changes between them. for that reason,
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// we refrain from equivalence checks (which would boil down to
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// string-matching known extensions to their equivalents).
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const char* oglHaveExtensions(int dummy, ...)
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{
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const char* ext;
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va_list args;
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va_start(args, dummy);
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for(;;)
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{
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ext = va_arg(args, const char*);
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// end of list reached; all were present => return 0.
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if(!ext)
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break;
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// not found => return name of missing extension.
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if(!oglHaveExtension(ext))
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break;
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}
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va_end(args);
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return ext;
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}
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static void importExtensionFunctions()
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{
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#define FUNC(ret, name, params) *(void**)&name = SDL_GL_GetProcAddress(#name);
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#define FUNC2(ret, nameARB, nameCore, version, params) \
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nameARB = NULL; \
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if(oglHaveVersion(version)) \
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*(void**)&nameARB = SDL_GL_GetProcAddress(#nameCore); \
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if(!nameARB) /* use the ARB name if the driver lied about what version it supports */ \
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*(void**)&nameARB = SDL_GL_GetProcAddress(#nameARB);
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#include "glext_funcs.h"
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#undef FUNC2
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#undef FUNC
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// It should be safe to load the ARB function pointers even if the
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// extension isn't advertised, since we won't actually use them without
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// checking for the extension.
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}
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//----------------------------------------------------------------------------
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static void dump_gl_error(GLenum err)
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{
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debug_printf("GL error: ");
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#define E(e) case e: debug_printf("%s\n", #e); break;
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switch (err)
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{
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E(GL_INVALID_ENUM)
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E(GL_INVALID_VALUE)
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E(GL_INVALID_OPERATION)
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E(GL_STACK_OVERFLOW)
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E(GL_STACK_UNDERFLOW)
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E(GL_OUT_OF_MEMORY)
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default:;
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}
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#undef E
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}
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#ifndef oglCheck
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// don't include this function if it has been defined (in ogl.h) as a no-op
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void oglCheck()
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{
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// glGetError may return multiple errors, so we poll it in a loop.
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// the debug_warn should only happen once (if this is set), though.
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bool error_enountered = false;
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for(;;)
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{
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GLenum err = glGetError();
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if(err == GL_NO_ERROR)
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break;
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error_enountered = true;
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dump_gl_error(err);
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}
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if(error_enountered)
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debug_warn("oglCheck reports error(s)");
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}
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#endif
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// ignore and reset the specified error (as returned by glGetError).
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// any other errors that have occurred are reported as oglCheck would.
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//
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// this is useful for suppressing annoying error messages, e.g.
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// "invalid enum" for GL_CLAMP_TO_EDGE even though we've already
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// warned the user that their OpenGL implementation is too old.
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void oglSquelchError(GLenum err_to_ignore)
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{
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// glGetError may return multiple errors, so we poll it in a loop.
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// the debug_warn should only happen once (if this is set), though.
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bool error_enountered = false;
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for(;;)
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{
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GLenum err = glGetError();
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if(err == GL_NO_ERROR)
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break;
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if(err == err_to_ignore)
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continue;
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error_enountered = true;
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dump_gl_error(err);
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}
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if(error_enountered)
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debug_warn("oglSquelchError reports other error(s)");
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}
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//----------------------------------------------------------------------------
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// feature and limit detect
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//----------------------------------------------------------------------------
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int ogl_max_tex_size = -1; // [pixels]
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int ogl_max_tex_units = -1; // limit on GL_TEXTUREn
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int ogl_max_VAR_elements = -1; // GF2: 64K; GF3: 1M
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int ogl_tex_compression_supported = -1; // S3TC / DXT{1,3,5}
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// gfx_card and gfx_drv_ver are unchanged on failure.
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int ogl_get_gfx_info()
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{
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const char* vendor = (const char*)glGetString(GL_VENDOR);
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const char* renderer = (const char*)glGetString(GL_RENDERER);
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const char* version = (const char*)glGetString(GL_VERSION);
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// can fail if OpenGL not yet initialized,
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// or if called between glBegin and glEnd.
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if(!vendor || !renderer || !version)
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return -1;
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strcpy_s(gfx_card, sizeof(gfx_card), vendor);
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// reduce string to "ATI" or "NVIDIA"
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if(!strcmp(gfx_card, "ATI Technologies Inc."))
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gfx_card[3] = 0;
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if(!strcmp(gfx_card, "NVIDIA Corporation"))
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gfx_card[6] = 0;
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strcat_s(gfx_card, sizeof(gfx_card), renderer);
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// don't bother cutting off the crap at the end.
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// too risky, and too many different strings.
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snprintf(gfx_drv_ver, sizeof(gfx_drv_ver), "OpenGL %s", version);
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// add "OpenGL" to differentiate this from the real driver version
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// (returned by platform-specific detect routines).
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return 0;
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}
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static void CALL_CONV emulate_glCompressedTexImage2D(GLenum, GLint, GLenum, GLsizei, GLsizei, GLint, GLsizei, const GLvoid*);
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static void detectFeatures()
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{
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glGetIntegerv(GL_MAX_TEXTURE_SIZE, &ogl_max_tex_size);
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glGetIntegerv(GL_MAX_TEXTURE_UNITS, &ogl_max_tex_units);
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// make sure value remains -1 if not supported
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if(oglHaveExtension("GL_NV_vertex_array_range"))
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glGetIntegerv(GL_MAX_VERTEX_ARRAY_RANGE_ELEMENT_NV, &ogl_max_VAR_elements);
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ogl_tex_compression_supported = oglHaveExtensions(0, "GL_ARB_texture_compression", "GL_EXT_texture_compression_s3tc", 0) == 0;
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// TODO: GL_S3_s3tc? It uses different enumerants (GL_RGB_S3TC etc), so the
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// texture loading code would need to be changed; and it is not clear whether
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// it supports the full range of DXT1/3/5. (There seems to be no specification;
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// and many header files don't have GL_RGBA_DXT5_S3TC, suggesting that the
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// drivers don't all support that.)
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if(!ogl_tex_compression_supported)
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{
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// If there's no hardware support for compressed textures, do the
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// decompression in software (but first let the user know it's probably not
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// going to be very fast).
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DISPLAY_ERROR(L"Performance warning: your graphics card does not support compressed textures. The game will try to continue anyway, but may be slower than expected. Please try updating your graphics drivers; if that doesn't help, please try upgrading your hardware.");
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// TODO: i18n
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glCompressedTexImage2DARB = emulate_glCompressedTexImage2D;
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// Leave ogl_tex_compression_supported == 0, so that it indicates the presence
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// of hardware-supported texture compression.
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}
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}
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// call after each video mode change, since thereafter extension functions
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// may have changed [address].
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void oglInit()
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{
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// cache extension list and versions for oglHave*.
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// note: this is less about performance (since the above are not
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// time-critical) than centralizing the 'OpenGL is ready' check.
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exts = (const char*)glGetString(GL_EXTENSIONS);
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if(!exts)
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{
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debug_warn("oglInit called before OpenGL is ready for use");
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}
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have_12 = oglHaveVersion("1.2");
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have_13 = oglHaveVersion("1.3");
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have_14 = oglHaveVersion("1.4");
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have_20 = oglHaveVersion("2.0");
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importExtensionFunctions();
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detectFeatures();
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}
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uint ogl_dxt_from_fmt(GLenum fmt)
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{
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switch(fmt)
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{
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case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
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return 1;
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case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
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return DXT1A;
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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return 3;
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case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
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return 5;
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default:
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return 0;
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}
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}
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// Software emulation of compressed-texture support, for really old
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// cards/drivers that can't do it (but which do support everything else
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// we strictly require). They probably don't have enough VRAM for all the
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// textures, and are slow anyway, so it's not going to be a pleasant way
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// of playing; but at least it's better than nothing.
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static void CALL_CONV emulate_glCompressedTexImage2D(
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GLenum target_, GLint level_, GLenum int_fmt,
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GLsizei w, GLsizei h, GLint border,
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GLsizei data_size, const GLvoid* data)
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{
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debug_assert(border == 0); // not supported by glCompressedTexImage2D
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// S3TC format info
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const uint dxt = ogl_dxt_from_fmt(int_fmt);
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debug_assert(dxt != 0 && "invalid internal format");
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const uint s3tc_bpp = (dxt == 3 || dxt == 5)? 8 : 4;
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const size_t s3tc_size = round_up(w,4)*round_up(h,4)*s3tc_bpp/8;
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debug_assert(s3tc_size == (size_t)data_size);
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// decompress DDS to RGB[A]
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Tex t;
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const uint flags = dxt;
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(void)tex_wrap((uint)w, (uint)h, s3tc_bpp, flags, (void*)data, &t);
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(void)tex_transform(&t, TEX_DXT);
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// uncompressed RGB[A] format info
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u8* const uc_data = tex_get_data(&t);
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GLenum uc_fmt = GL_RGB;
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GLint uc_int_fmt = GL_RGB8;
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if(dxt != 1)
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{
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uc_fmt = GL_RGBA;
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uc_int_fmt = GL_RGBA8;
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}
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glTexImage2D(target_, level_, uc_int_fmt, w, h, 0, uc_fmt, GL_UNSIGNED_BYTE, uc_data);
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(void)tex_free(&t);
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} |