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lxdream.org :: lxdream/src/drivers/video_gl.c
lxdream 0.9.1
released Jun 29
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filename src/drivers/video_gl.c
changeset 1246:887f7b0ac7f3
prev1244:6b54ef5ed413
next1251:b8ab59d39756
author nkeynes
date Sat Mar 03 00:17:36 2012 +1000 (8 years ago)
permissions -rw-r--r--
last change Fix GLX compile
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     1 /**
     2  * $Id$
     3  *
     4  * Common GL code that doesn't depend on a specific implementation
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include <sys/time.h>
    21 #include "display.h"
    22 #include "pvr2/pvr2.h"
    23 #include "pvr2/glutil.h"
    24 #include "pvr2/shaders.h"
    25 #include "drivers/video_gl.h"
    27 /* FIXME: Need to actually handle this case */
    28 #ifndef GL_PACK_ROW_LENGTH
    29 #define glPixelStorei(key,val)
    30 #endif
    32 uint32_t video_width, video_height;
    33 struct video_vertex {
    34     float x,y;
    35     float u,v;
    36     float r,g,b,a;
    37 };
    39 static struct video_box_t {
    40     float viewMatrix[16];
    41     struct video_vertex gap1[4];
    42     struct video_vertex gap2[4];
    43     struct video_vertex video_view[4];
    44     struct video_vertex invert_view[4];
    45 } video_box;
    47 void gl_set_video_size( uint32_t width, uint32_t height )
    48 {
    49     video_width = width;
    50     video_height = height;
    52     int x1=0,y1=0,x2=video_width,y2=video_height;
    54     int ah = video_width * 0.75;
    56     if( ah > video_height ) {
    57         int w = (video_height/0.75);
    58         x1 = (video_width - w)/2;
    59         x2 -= x1;
    60         video_box.gap1[0].x = 0; video_box.gap1[0].y = 0;
    61         video_box.gap1[1].x = x1; video_box.gap1[1].y = 0;
    62         video_box.gap1[2].x = 0; video_box.gap1[2].y = video_height;
    63         video_box.gap1[3].x = x2; video_box.gap1[3].y = video_height;
    64         video_box.gap2[0].x = x2; video_box.gap2[0].y = 0;
    65         video_box.gap2[1].x = video_width; video_box.gap2[1].y = 0;
    66         video_box.gap2[2].x = x2; video_box.gap2[2].y = video_height;
    67         video_box.gap2[3].x = video_width; video_box.gap2[3].y = video_height;
    68     } else if( ah < video_height ) {
    69         y1 = (video_height - ah)/2;
    70         y2 -= y1;
    72         video_box.gap1[0].x = 0; video_box.gap1[0].y = 0;
    73         video_box.gap1[1].x = video_width; video_box.gap1[1].y = 0;
    74         video_box.gap1[2].x = 0; video_box.gap1[2].y = y1;
    75         video_box.gap1[3].x = video_width; video_box.gap1[3].y = y1;
    76         video_box.gap2[0].x = 0; video_box.gap2[0].y = y2;
    77         video_box.gap2[1].x = video_width; video_box.gap2[1].y = y2;
    78         video_box.gap2[2].x = 0; video_box.gap2[2].y = video_height;
    79         video_box.gap2[3].x = video_width; video_box.gap2[3].y = video_height;
    80     }
    82     video_box.video_view[0].x = x1; video_box.video_view[0].y = y1;
    83     video_box.video_view[0].u = 0; video_box.video_view[0].v = 0;
    84     video_box.video_view[1].x = x2; video_box.video_view[1].y = y1;
    85     video_box.video_view[1].u = 1; video_box.video_view[1].v = 0;
    86     video_box.video_view[2].x = x1; video_box.video_view[2].y = y2;
    87     video_box.video_view[2].u = 0; video_box.video_view[2].v = 1;
    88     video_box.video_view[3].x = x2; video_box.video_view[3].y = y2;
    89     video_box.video_view[3].u = 1; video_box.video_view[3].v = 1;
    91     memcpy( &video_box.invert_view, &video_box.video_view, sizeof(video_box.video_view) );
    92     video_box.invert_view[0].v = 1; video_box.invert_view[1].v = 1;
    93     video_box.invert_view[2].v = 0; video_box.invert_view[3].v = 0;
    95     defineOrthoMatrix(video_box.viewMatrix, video_width, video_height, 0, 65535);
    96 }
    98 #ifdef HAVE_OPENGL_FIXEDFUNC
    99 /**
   100  * Setup the gl context for writes to the display output.
   101  */
   102 void gl_framebuffer_setup()
   103 {
   104     glViewport( 0, 0, video_width, video_height );
   105     glLoadMatrixf(video_box.viewMatrix);
   106     glBlendFunc( GL_ONE, GL_ZERO );
   107     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
   108     glVertexPointer(2, GL_FLOAT, sizeof(struct video_vertex), &video_box.gap1[0].x);
   109     glColorPointer(3, GL_FLOAT, sizeof(struct video_vertex), &video_box.gap1[0].r);
   110     glTexCoordPointer(2, GL_FLOAT, sizeof(struct video_vertex), &video_box.gap1[0].u);
   111     glEnableClientState( GL_VERTEX_ARRAY );
   112     glEnableClientState( GL_COLOR_ARRAY );
   113     glEnableClientState( GL_TEXTURE_COORD_ARRAY );
   114 }
   116 void gl_framebuffer_cleanup()
   117 {
   118     glDisableClientState( GL_VERTEX_ARRAY );
   119     glDisableClientState( GL_COLOR_ARRAY );
   120     glDisableClientState( GL_TEXTURE_COORD_ARRAY );
   121 }
   122 #else
   123 void gl_framebuffer_setup()
   124 {
   125     glViewport( 0, 0, video_width, video_height );
   126     glBlendFunc( GL_ONE, GL_ZERO );
   127     glsl_use_basic_shader();
   128     glsl_set_basic_shader_view_matrix(video_box.viewMatrix);
   129     glsl_set_basic_shader_in_vertex_pointer(&video_box.gap1[0].x, sizeof(struct video_vertex));
   130     glsl_set_basic_shader_in_colour_pointer(&video_box.gap1[0].r, sizeof(struct video_vertex));
   131     glsl_set_basic_shader_in_texcoord_pointer(&video_box.gap1[0].u, sizeof(struct video_vertex));
   132     glsl_set_basic_shader_primary_texture(0);
   133 }
   135 void gl_framebuffer_cleanup()
   136 {
   137     glsl_clear_shader();
   138 }
   139 #endif
   141 void gl_display_render_buffer( render_buffer_t buffer )
   142 {
   143     gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
   144 }
   146 /**
   147  * Convert window coordinates to dreamcast device coords (640x480) using the 
   148  * same viewable area as gl_texture_window.
   149  * If the coordinates are outside the viewable area, the result is -1,-1.
   150  */ 
   151 void gl_window_to_system_coords( int *x, int *y )
   152 {
   153     int x1=0,y1=0,x2=video_width,y2=video_height;
   155     int ah = video_width * 0.75;
   157     if( ah > video_height ) {
   158         int w = (video_height/0.75);
   159         x1 = (video_width - w)/2;
   160         x2 -= x1;
   161     } else if( ah < video_height ) {
   162         y1 = (video_height - ah)/2;
   163         y2 -= y1;
   164     }
   165     if( *x < x1 || *x >= x2 || *y < y1 || *y >= y2 ) {
   166         *x = -1;
   167         *y = -1;
   168     } else {
   169         *x = (*x - x1) * DISPLAY_WIDTH / (x2-x1);
   170         *y = (*y - y1) * DISPLAY_HEIGHT / (y2-y1);
   171     }
   172 }
   174 void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
   175 {
   176     /* Set video box tex alpha to 1 */
   177     video_box.video_view[0].a = video_box.video_view[1].a = video_box.video_view[2].a = video_box.video_view[3].a = 1;
   179     /* Reset display parameters */
   180     gl_framebuffer_setup();
   181     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
   182     glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
   183     glEnable(GL_TEXTURE_2D);
   184     glBindTexture(GL_TEXTURE_2D,tex_id);
   185     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   186     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   187     glDrawArrays(GL_TRIANGLE_STRIP, inverted ? 12 : 8, 4);
   188     glDisable(GL_TEXTURE_2D);
   189     glFlush();
   190     gl_framebuffer_cleanup();
   191 }
   193 gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
   194 {
   195     GLenum type = colour_formats[frame->colour_format].type;
   196     GLenum format = colour_formats[frame->colour_format].format;
   197     int bpp = colour_formats[frame->colour_format].bpp;
   198     int rowstride = (frame->rowstride / bpp) - frame->width;
   200     glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
   201     glBindTexture( GL_TEXTURE_2D, tex_id );
   202     glTexSubImage2D( GL_TEXTURE_2D, 0, 0,0,
   203                      frame->width, frame->height, format, type, frame->data );
   204     glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
   205     return TRUE;
   206 }
   208 void gl_display_blank( uint32_t colour )
   209 {
   210     /* Set the video_box background colour */
   211     video_box.video_view[0].r = ((float)(((colour >> 16) & 0xFF) + 1)) / 256.0;
   212     video_box.video_view[0].g = ((float)(((colour >> 8) & 0xFF) + 1)) / 256.0;
   213     video_box.video_view[0].b = ((float)((colour & 0xFF) + 1)) / 256.0;
   214     video_box.video_view[0].a = 0;
   215     memcpy( &video_box.video_view[1].r, &video_box.video_view[0].r, sizeof(float)*3 );
   216     memcpy( &video_box.video_view[2].r, &video_box.video_view[0].r, sizeof(float)*3 );
   217     memcpy( &video_box.video_view[3].r, &video_box.video_view[0].r, sizeof(float)*3 );
   219     /* And render */
   220     gl_framebuffer_setup();
   221     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
   222     glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
   223     glDrawArrays(GL_TRIANGLE_STRIP, 8, 4);
   224     glFlush();
   225     gl_framebuffer_cleanup();
   226 }
   228 /**
   229  * Generic GL read_render_buffer. This function assumes that the caller
   230  * has already set the appropriate glReadBuffer(); in other words, unless
   231  * there's only one buffer this needs to be wrapped.
   232  */
   233 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer, 
   234                                 int rowstride, int colour_format ) 
   235 {
   236     glFinish();
   237     GLenum type = colour_formats[colour_format].type;
   238     GLenum format = colour_formats[colour_format].format;
   239     // int line_size = buffer->width * colour_formats[colour_format].bpp;
   240     // int size = line_size * buffer->height;
   241     int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
   242     glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
   243     glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
   244     glPixelStorei( GL_PACK_ROW_LENGTH, 0 );
   245     return TRUE;
   246 }
   248 static gboolean video_gl_init();
   250 /**
   251  * Minimal GL driver (assuming that the GL context is already set up externally)
   252  * This requires FBO support (since otherwise we have no way to get a render buffer)
   253  */
   254 struct display_driver display_gl_driver = {
   255         "gl", N_("OpenGL driver"), video_gl_init, NULL,
   256         NULL, NULL, NULL,
   257         NULL, NULL, NULL, NULL,
   258         gl_load_frame_buffer, gl_display_render_buffer, gl_display_blank,
   259         NULL, gl_read_render_buffer, NULL, NULL
   260 };
   262 static gboolean video_gl_init()
   263 {
   264      if( gl_fbo_is_supported() ) {
   265          display_gl_driver.capabilities.has_gl = TRUE;
   266          gl_fbo_init(&display_gl_driver);
   267          gl_vbo_init(&display_gl_driver);
   268          return TRUE;
   269      } else {
   270          return FALSE;
   271      }
   272 }
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