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_memory.h"      /* Offset() */
  14 #include "util/u_draw_quad.h"
  15
  16 enum pipe_format formats[] = {
  17    PIPE_FORMAT_R8G8B8A8_UNORM,
  18    PIPE_FORMAT_B8G8R8A8_UNORM,
  19    PIPE_FORMAT_NONE
  20 };
  21
  22 static const int WIDTH = 300;
  23 static const int HEIGHT = 300;
  24
  25 static struct pipe_screen *screen = NULL;
  26 static struct pipe_context *ctx = NULL;
  27 static struct pipe_surface *surf = NULL;
  28 static struct pipe_resource *tex = 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.buffer_offset = 0;
  97    vbuf.buffer = screen->user_buffer_create(screen,
  98                                             vertices,
  99                                             sizeof(vertices),
 100                                             PIPE_BIND_VERTEX_BUFFER);
 101
 102    ctx->set_vertex_buffers(ctx, 1, &vbuf);
 103 }
 104
 105 static void set_vertex_shader( void )
 106 {
 107    void *handle;
 108    const char *text =
 109       "VERT\n"
 110       "DCL IN[0]\n"
 111       "DCL IN[1]\n"
 112       "DCL OUT[0], POSITION\n"
 113       "DCL OUT[1], COLOR\n"
 114       "  0: MOV OUT[1], IN[1]\n"
 115       "  1: MOV OUT[0], IN[0]\n"
 116       "  2: END\n";
 117
 118    handle = graw_parse_vertex_shader(ctx, text);
 119    ctx->bind_vs_state(ctx, handle);
 120 }
 121
 122 static void set_fragment_shader( void )
 123 {
 124    void *handle;
 125    const char *text =
 126       "FRAG\n"
 127       "DCL IN[0], COLOR, LINEAR\n"
 128       "DCL OUT[0], COLOR\n"
 129       "  0: MOV OUT[0], IN[0]\n"
 130       "  1: END\n";
 131
 132    handle = graw_parse_fragment_shader(ctx, text);
 133    ctx->bind_fs_state(ctx, handle);
 134 }
 135
 136
 137 static void draw( void )
 138 {
 139    float clear_color[4] = {1,0,1,1};
 140
 141    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 142    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 143    ctx->flush(ctx, NULL);
 144
 145    graw_save_surface_to_file(ctx, surf, NULL);
 146
 147    screen->flush_frontbuffer(screen, tex, 0, 0, window);
 148 }
 149
 150
 151 static void init( void )
 152 {
 153    struct pipe_framebuffer_state fb;
 154    struct pipe_resource templat;
 155    struct pipe_surface surf_tmpl;
 156    int i;
 157
 158    /* It's hard to say whether window or screen should be created
 159     * first.  Different environments would prefer one or the other.
 160     *
 161     * Also, no easy way of querying supported formats if the screen
 162     * cannot be created first.
 163     */
 164    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
 165       screen = graw_create_window_and_screen(0, 0, 300, 300,
 166                                              formats[i],
 167                                              &window);
 168       if (window && screen)
 169          break;
 170    }
 171    if (!screen || !window) {
 172       fprintf(stderr, "Unable to create window\n");
 173       exit(1);
 174    }
 175
 176    ctx = screen->context_create(screen, NULL);
 177    if (ctx == NULL) {
 178       fprintf(stderr, "Unable to create context!\n");
 179       exit(3);
 180    }
 181
 182    templat.target = PIPE_TEXTURE_2D;
 183    templat.format = formats[i];
 184    templat.width0 = WIDTH;
 185    templat.height0 = HEIGHT;
 186    templat.depth0 = 1;
 187    templat.array_size = 1;
 188    templat.last_level = 0;
 189    templat.nr_samples = 1;
 190    templat.bind = (PIPE_BIND_RENDER_TARGET |
 191                    PIPE_BIND_DISPLAY_TARGET);
 192
 193    tex = screen->resource_create(screen,
 194                                  &templat);
 195    if (tex == NULL) {
 196       fprintf(stderr, "Unable to create screen texture!\n");
 197       exit(4);
 198    }
 199
 200    surf_tmpl.format = templat.format;
 201    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 202    surf_tmpl.u.tex.level = 0;
 203    surf_tmpl.u.tex.first_layer = 0;
 204    surf_tmpl.u.tex.last_layer = 0;
 205    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
 206    if (surf == NULL) {
 207       fprintf(stderr, "Unable to create tex surface!\n");
 208       exit(5);
 209    }
 210
 211    memset(&fb, 0, sizeof fb);
 212    fb.nr_cbufs = 1;
 213    fb.width = WIDTH;
 214    fb.height = HEIGHT;
 215    fb.cbufs[0] = surf;
 216
 217    ctx->set_framebuffer_state(ctx, &fb);
 218
 219    {
 220       struct pipe_blend_state blend;
 221       void *handle;
 222       memset(&blend, 0, sizeof blend);
 223       blend.rt[0].colormask = PIPE_MASK_RGBA;
 224       handle = ctx->create_blend_state(ctx, &blend);
 225       ctx->bind_blend_state(ctx, handle);
 226    }
 227
 228    {
 229       struct pipe_depth_stencil_alpha_state depthstencil;
 230       void *handle;
 231       memset(&depthstencil, 0, sizeof depthstencil);
 232       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 233       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 234    }
 235
 236    {
 237       struct pipe_rasterizer_state rasterizer;
 238       void *handle;
 239       memset(&rasterizer, 0, sizeof rasterizer);
 240       rasterizer.cull_face = PIPE_FACE_NONE;
 241       rasterizer.gl_rasterization_rules = 1;
 242       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 243       ctx->bind_rasterizer_state(ctx, handle);
 244    }
 245
 246    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 247    set_vertices();
 248    set_vertex_shader();
 249    set_fragment_shader();
 250 }
 251
 252 static void args(int argc, char *argv[])
 253 {
 254    int i;
 255
 256    for (i = 1; i < argc;) {
 257       if (graw_parse_args(&i, argc, argv)) {
 258          continue;
 259       }
 260       exit(1);
 261    }
 262 }
 263
 264 int main( int argc, char *argv[] )
 265 {
 266    args(argc, argv);
 267    init();
 268
 269    graw_set_display_func( draw );
 270    graw_main_loop();
 271    return 0;
 272 }