src/gallium/tests/graw/tri.c

   1 /* Display a cleared blue window.  This demo has no dependencies on
   2  * any utility code, just the graw interface and gallium.
   3  */
   4
   5 #include <stdio.h>
   6
   7 #include "state_tracker/graw.h"
   8 #include "pipe/p_screen.h"
   9 #include "pipe/p_context.h"
  10 #include "pipe/p_state.h"
  11 #include "pipe/p_defines.h"
  12
  13 #include "util/u_debug.h"       /* debug_dump_surface_bmp() */
  14 #include "util/u_memory.h"      /* Offset() */
  15 #include "util/u_draw_quad.h"
  16
  17 enum pipe_format formats[] = {
  18    PIPE_FORMAT_R8G8B8A8_UNORM,
  19    PIPE_FORMAT_B8G8R8A8_UNORM,
  20    PIPE_FORMAT_NONE
  21 };
  22
  23 static const int WIDTH = 300;
  24 static const int HEIGHT = 300;
  25
  26 static struct pipe_screen *screen = NULL;
  27 static struct pipe_context *ctx = NULL;
  28 static struct pipe_surface *surf = NULL;
  29 static void *window = NULL;
  30
  31 struct vertex {
  32    float position[4];
  33    float color[4];
  34 };
  35
  36 static struct vertex vertices[3] =
  37 {
  38    {
  39       { 0.0f, -0.9f, 0.0f, 1.0f },
  40       { 1.0f, 0.0f, 0.0f, 1.0f }
  41    },
  42    {
  43       { -0.9f, 0.9f, 0.0f, 1.0f },
  44       { 0.0f, 1.0f, 0.0f, 1.0f }
  45    },
  46    {
  47       { 0.9f, 0.9f, 0.0f, 1.0f },
  48       { 0.0f, 0.0f, 1.0f, 1.0f }
  49    }
  50 };
  51
  52
  53
  54
  55 static void set_viewport( float x, float y,
  56                           float width, float height,
  57                           float near, float far)
  58 {
  59    float z = far;
  60    float half_width = (float)width / 2.0f;
  61    float half_height = (float)height / 2.0f;
  62    float half_depth = ((float)far - (float)near) / 2.0f;
  63    struct pipe_viewport_state vp;
  64
  65    vp.scale[0] = half_width;
  66    vp.scale[1] = half_height;
  67    vp.scale[2] = half_depth;
  68    vp.scale[3] = 1.0f;
  69
  70    vp.translate[0] = half_width + x;
  71    vp.translate[1] = half_height + y;
  72    vp.translate[2] = half_depth + z;
  73    vp.translate[3] = 0.0f;
  74
  75    ctx->set_viewport_state( ctx, &vp );
  76 }
  77
  78 static void set_vertices( void )
  79 {
  80    struct pipe_vertex_element ve[2];
  81    struct pipe_vertex_buffer vbuf;
  82    void *handle;
  83
  84    memset(ve, 0, sizeof ve);
  85
  86    ve[0].src_offset = Offset(struct vertex, position);
  87    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  88    ve[1].src_offset = Offset(struct vertex, color);
  89    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  90
  91    handle = ctx->create_vertex_elements_state(ctx, 2, ve);
  92    ctx->bind_vertex_elements_state(ctx, handle);
  93
  94
  95    vbuf.stride = sizeof( struct vertex );
  96    vbuf.max_index = sizeof(vertices) / vbuf.stride;
  97    vbuf.buffer_offset = 0;
  98    vbuf.buffer = screen->user_buffer_create(screen,
  99                                             vertices,
 100                                             sizeof(vertices),
 101                                             PIPE_BIND_VERTEX_BUFFER);
 102
 103    ctx->set_vertex_buffers(ctx, 1, &vbuf);
 104 }
 105
 106 static void set_vertex_shader( void )
 107 {
 108    void *handle;
 109    const char *text =
 110       "VERT\n"
 111       "DCL IN[0]\n"
 112       "DCL IN[1]\n"
 113       "DCL OUT[0], POSITION\n"
 114       "DCL OUT[1], COLOR\n"
 115       "  0: MOV OUT[1], IN[1]\n"
 116       "  1: MOV OUT[0], IN[0]\n"
 117       "  2: END\n";
 118
 119    handle = graw_parse_vertex_shader(ctx, text);
 120    ctx->bind_vs_state(ctx, handle);
 121 }
 122
 123 static void set_fragment_shader( void )
 124 {
 125    void *handle;
 126    const char *text =
 127       "FRAG\n"
 128       "DCL IN[0], COLOR, LINEAR\n"
 129       "DCL OUT[0], COLOR\n"
 130       "  0: MOV OUT[0], IN[0]\n"
 131       "  1: END\n";
 132
 133    handle = graw_parse_fragment_shader(ctx, text);
 134    ctx->bind_fs_state(ctx, handle);
 135 }
 136
 137
 138 static void draw( void )
 139 {
 140    float clear_color[4] = {1,0,1,1};
 141
 142    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 143    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 144    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 145
 146 #if 0
 147    /* At the moment, libgraw leaks out/makes available some of the
 148     * symbols from gallium/auxiliary, including these debug helpers.
 149     * Will eventually want to bless some of these paths, and lock the
 150     * others down so they aren't accessible from test programs.
 151     *
 152     * This currently just happens to work on debug builds - a release
 153     * build will probably fail to link here:
 154     */
 155    debug_dump_surface_bmp(ctx, "result.bmp", surf);
 156 #endif
 157
 158    screen->flush_frontbuffer(screen, surf, window);
 159 }
 160
 161
 162 static void init( void )
 163 {
 164    struct pipe_framebuffer_state fb;
 165    struct pipe_resource *tex, templat;
 166    int i;
 167
 168    /* It's hard to say whether window or screen should be created
 169     * first.  Different environments would prefer one or the other.
 170     *
 171     * Also, no easy way of querying supported formats if the screen
 172     * cannot be created first.
 173     */
 174    for (i = 0;
 175         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 176         i++) {
 177
 178       screen = graw_create_window_and_screen(0,0,300,300,
 179                                              formats[i],
 180                                              &window);
 181    }
 182
 183    ctx = screen->context_create(screen, NULL);
 184    if (ctx == NULL) {
 185       fprintf(stderr, "Unable to create context!\n");
 186       exit(3);
 187    }
 188
 189    templat.target = PIPE_TEXTURE_2D;
 190    templat.format = formats[i];
 191    templat.width0 = WIDTH;
 192    templat.height0 = HEIGHT;
 193    templat.depth0 = 1;
 194    templat.last_level = 0;
 195    templat.nr_samples = 1;
 196    templat.bind = (PIPE_BIND_RENDER_TARGET |
 197                    PIPE_BIND_DISPLAY_TARGET);
 198
 199    tex = screen->resource_create(screen,
 200                                  &templat);
 201    if (tex == NULL) {
 202       fprintf(stderr, "Unable to create screen texture!\n");
 203       exit(4);
 204    }
 205
 206    surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 207                                   PIPE_BIND_RENDER_TARGET |
 208                                   PIPE_BIND_DISPLAY_TARGET);
 209    if (surf == NULL) {
 210       fprintf(stderr, "Unable to get tex surface!\n");
 211       exit(5);
 212    }
 213
 214    memset(&fb, 0, sizeof fb);
 215    fb.nr_cbufs = 1;
 216    fb.width = WIDTH;
 217    fb.height = HEIGHT;
 218    fb.cbufs[0] = surf;
 219
 220    ctx->set_framebuffer_state(ctx, &fb);
 221
 222    {
 223       struct pipe_blend_state blend;
 224       void *handle;
 225       memset(&blend, 0, sizeof blend);
 226       blend.rt[0].colormask = PIPE_MASK_RGBA;
 227       handle = ctx->create_blend_state(ctx, &blend);
 228       ctx->bind_blend_state(ctx, handle);
 229    }
 230
 231    {
 232       struct pipe_depth_stencil_alpha_state depthstencil;
 233       void *handle;
 234       memset(&depthstencil, 0, sizeof depthstencil);
 235       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 236       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 237    }
 238
 239    {
 240       struct pipe_rasterizer_state rasterizer;
 241       void *handle;
 242       memset(&rasterizer, 0, sizeof rasterizer);
 243       rasterizer.cull_face = PIPE_FACE_NONE;
 244       rasterizer.gl_rasterization_rules = 1;
 245       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 246       ctx->bind_rasterizer_state(ctx, handle);
 247    }
 248
 249    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 250    set_vertices();
 251    set_vertex_shader();
 252    set_fragment_shader();
 253 }
 254
 255
 256 int main( int argc, char *argv[] )
 257 {
 258    init();
 259
 260    graw_set_display_func( draw );
 261    graw_main_loop();
 262    return 0;
 263 }