mirror of
https://github.com/id-Software/DOOM-iOS.git
synced 2025-02-22 11:31:48 +00:00
211 lines
7.4 KiB
C
211 lines
7.4 KiB
C
/*
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* SDL_opengl.h
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* doom
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*
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* Created by John Carmack on 4/13/09.
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* Copyright 2009 idSoftware. All rights reserved.
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*
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* iPhone glue to get the prBoom code compiling
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* Replaces SDL_opengl.h
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*/
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#ifndef __SDL_OPENGL_H__
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#define __SDL_OPENGL_H__
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#include <OpenGLES/ES1/gl.h>
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#include <OpenGLES/ES1/glext.h>
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#define GLAPIENTRY
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// this needs to be added before each projection matrix
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int iphoneRotateForLandscape();
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// no colorTable in ES
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typedef void (* PFNGLCOLORTABLEEXTPROC) (GLenum target, GLenum internalFormat, GLsizei width, GLenum format, GLenum type, const GLvoid *table);
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static GLubyte *gluErrorString( int err ) { return (GLubyte *)"GLU error"; }
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static void *SDL_GL_GetProcAddress( const char *proc ) { return 0; }
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static void SDL_GL_SwapBuffers() {}
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// we need to emulate immediate mode gl for ES
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void glBegin( GLenum prim );
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void glVertex3f( GLfloat x, GLfloat y, GLfloat z );
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void glVertex3fv( GLfloat *xyz );
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void glVertex2f( GLfloat x, GLfloat y );
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void glVertex2i( GLint x, GLint y );
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void glTexCoord2i( GLint s, GLint t );
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void glTexCoord2f( GLfloat s, GLfloat t );
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void glTexCoord2fv( GLfloat *st );
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void glEnd();
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// Doom just uses state color for all draw calls, setting it once
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// before a glBegin, rather than setting it each vertex, so we
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// don't need to emulate the color functions.
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//#defne VERTEX_COLOR
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#ifdef VERTEX_COLOR
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void glColor4ub( GLubyte r, GLubyte g, GLubyte b, GLubyte a );
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void glColor4f( GLfloat r, GLfloat g, GLfloat b, GLfloat a );
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void glColor4fv( GLfloat *rgba );
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void glColor3f( GLfloat r, GLfloat g, GLfloat b );
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#endif
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// GLES only defines glColor4ub and glColor4f, so define the others in terms of that
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#define glColor4fv(x) glColor4f(x[0],x[1],x[2],x[3])
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#define glColor4ubv(x) glColor4ub(x[0],x[1],x[2],x[3])
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#define glColor3f(r,g,b) glColor4f(r,g,b,1)
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// The width and height need to be flipped for iPhone landscape mode,
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// so redefine these functions to something that can do the work behind
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// the scenes.
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void landscapeViewport( GLint x, GLint y, GLsizei width, GLsizei height );
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void landscapeScissor( GLint x, GLint y, GLsizei width, GLsizei height );
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#define glViewport landscapeViewport
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#define glScissor landscapeScissor
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// ES made matching fixed and floating versions of some functions
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#define glClearDepth glClearDepthf
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#define glOrtho glOrthof
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#define glFogi glFogx
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// no GLdouble in ES, but needed for glu tesselator
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typedef double GLdouble;
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// ES doesn't have the messy clamp-to-half-border mode
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#define GL_CLAMP GL_CLAMP_TO_EDGE
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// this is the internal format used by the prBoom gl code
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// ES doesn't allow format conversions between external and internal,
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// so we need to manually convert to 5551 before doing glTexSubImage
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#define GL_RGB5_A1 GL_RGBA
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#define GL_RGBA8 GL_RGBA
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#define GL_RGBA4 GL_RGBA
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#define GL_RGBA2 GL_RGBA
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// not available in ES, so prBoom's skies must be implemeted differently
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static void glTexGenfv( int a, int b, void *c ) { };
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static void glTexGenf( int a, int b, int c ) { };
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// texGen enums not present in ES
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#define GL_S 0x2000
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#define GL_T 0x2001
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#define GL_R 0x2002
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#define GL_Q 0x2003
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#define GL_OBJECT_LINEAR 0x2401
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#define GL_OBJECT_PLANE 0x2501
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#define GL_EYE_LINEAR 0x2400
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#define GL_EYE_PLANE 0x2502
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#define GL_TEXTURE_GEN_MODE 0x2500
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#define GL_TEXTURE_GEN_S 0x0C60
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#define GL_TEXTURE_GEN_T 0x0C61
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#define GL_TEXTURE_GEN_R 0x0C62
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#define GL_TEXTURE_GEN_Q 0x0C63
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// other extensions not present in ES
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// Whlle the iPhone exports the extension for paletted
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// textures, it isn't actually supported in hardware, so
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// they are expanded internally on glTexImage2D, making their
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// use completely counterproductive.
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#define GL_SHARED_TEXTURE_PALETTE_EXT 0x81FB
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#define GL_COLOR_INDEX 0x1900
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#define GL_COLOR_INDEX8_EXT 0x80E5
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//===========================
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// all this for the glu tesselator, used by prBoom to make drawable sector geometry
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//===========================
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#include "../libtess/tess.h"
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/* TessCallback */
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#define GLU_TESS_BEGIN 100100
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#define GLU_BEGIN 100100
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#define GLU_TESS_VERTEX 100101
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#define GLU_VERTEX 100101
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#define GLU_TESS_END 100102
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#define GLU_END 100102
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#define GLU_TESS_ERROR 100103
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#define GLU_TESS_EDGE_FLAG 100104
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#define GLU_EDGE_FLAG 100104
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#define GLU_TESS_COMBINE 100105
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#define GLU_TESS_BEGIN_DATA 100106
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#define GLU_TESS_VERTEX_DATA 100107
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#define GLU_TESS_END_DATA 100108
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#define GLU_TESS_ERROR_DATA 100109
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#define GLU_TESS_EDGE_FLAG_DATA 100110
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#define GLU_TESS_COMBINE_DATA 100111
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/* TessContour */
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#define GLU_CW 100120
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#define GLU_CCW 100121
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#define GLU_INTERIOR 100122
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#define GLU_EXTERIOR 100123
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#define GLU_UNKNOWN 100124
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/* TessProperty */
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#define GLU_TESS_WINDING_RULE 100140
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#define GLU_TESS_BOUNDARY_ONLY 100141
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#define GLU_TESS_TOLERANCE 100142
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/* TessError */
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#define GLU_TESS_ERROR1 100151
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#define GLU_TESS_ERROR2 100152
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#define GLU_TESS_ERROR3 100153
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#define GLU_TESS_ERROR4 100154
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#define GLU_TESS_ERROR5 100155
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#define GLU_TESS_ERROR6 100156
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#define GLU_TESS_ERROR7 100157
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#define GLU_TESS_ERROR8 100158
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#define GLU_TESS_MISSING_BEGIN_POLYGON 100151
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#define GLU_TESS_MISSING_BEGIN_CONTOUR 100152
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#define GLU_TESS_MISSING_END_POLYGON 100153
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#define GLU_TESS_MISSING_END_CONTOUR 100154
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#define GLU_TESS_COORD_TOO_LARGE 100155
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#define GLU_TESS_NEED_COMBINE_CALLBACK 100156
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/* TessWinding */
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#define GLU_TESS_WINDING_ODD 100130
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#define GLU_TESS_WINDING_NONZERO 100131
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#define GLU_TESS_WINDING_POSITIVE 100132
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#define GLU_TESS_WINDING_NEGATIVE 100133
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#define GLU_TESS_WINDING_ABS_GEQ_TWO 100134
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/* ErrorCode */
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#define GLU_INVALID_ENUM 100900
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#define GLU_INVALID_VALUE 100901
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#define GLU_OUT_OF_MEMORY 100902
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#define GLU_INCOMPATIBLE_GL_VERSION 100903
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#define GLU_INVALID_OPERATION 100904
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#define GLAPI
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#define GLAPIENTRYP
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typedef struct GLUtesselator GLUtesselator;
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typedef GLUtesselator GLUtesselatorObj;
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typedef GLUtesselator GLUtriangulatorObj;
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#define GLU_TESS_MAX_COORD 1.0e150
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/* Internal convenience typedefs */
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typedef void (GLAPIENTRYP _GLUfuncptr)();
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GLAPI void GLAPIENTRY gluTessBeginContour (GLUtesselator* tess);
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GLAPI void GLAPIENTRY gluTessBeginPolygon (GLUtesselator* tess, GLvoid* data);
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GLAPI void GLAPIENTRY gluTessCallback (GLUtesselator* tess, GLenum which, _GLUfuncptr CallBackFunc);
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GLAPI void GLAPIENTRY gluTessEndContour (GLUtesselator* tess);
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GLAPI void GLAPIENTRY gluTessEndPolygon (GLUtesselator* tess);
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GLAPI void GLAPIENTRY gluTessNormal (GLUtesselator* tess, GLdouble valueX, GLdouble valueY, GLdouble valueZ);
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GLAPI void GLAPIENTRY gluTessProperty (GLUtesselator* tess, GLenum which, GLdouble data);
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GLAPI void GLAPIENTRY gluTessVertex (GLUtesselator* tess, GLdouble *location, GLvoid* data);
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GLUtesselator * GLAPIENTRY gluNewTess( void );
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void GLAPIENTRY gluDeleteTess( GLUtesselator *tess );
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#endif
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