The DOOM Classic for iPhone 1.0 source as released on November 3, 2009

code/prboom/SDL_opengl.h

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