src/gallium/tests/graw/tri-gs.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 "state_tracker/graw.h"
   6 #include "pipe/p_screen.h"
   7 #include "pipe/p_context.h"
   8 #include "pipe/p_state.h"
   9 #include "pipe/p_defines.h"
  10
  11 #include "util/u_debug.h"       /* debug_dump_surface_bmp() */
  12 #include "util/u_memory.h"      /* Offset() */
  13 #include "util/u_draw_quad.h"
  14
  15 enum pipe_format formats[] = {
  16    PIPE_FORMAT_R8G8B8A8_UNORM,
  17    PIPE_FORMAT_B8G8R8A8_UNORM,
  18    PIPE_FORMAT_NONE
  19 };
  20
  21 static const int WIDTH = 300;
  22 static const int HEIGHT = 300;
  23
  24 static struct pipe_screen *screen = NULL;
  25 static struct pipe_context *ctx = NULL;
  26 static struct pipe_surface *surf = NULL;
  27 static void *window = NULL;
  28
  29 struct vertex {
  30    float position[4];
  31    float color[4];
  32 };
  33
  34 static struct vertex vertices[4] =
  35 {
  36    { { 0.0f, -0.9f, 0.0f, 1.0f },
  37      { 1.0f, 0.0f, 0.0f, 1.0f }
  38    },
  39    { { -0.9f, 0.9f, 0.0f, 1.0f },
  40      { 0.0f, 1.0f, 0.0f, 1.0f }
  41    },
  42    { { 0.9f, 0.9f, 0.0f, 1.0f },
  43      { 0.0f, 0.0f, 1.0f, 1.0f }
  44    }
  45 };
  46
  47
  48
  49
  50 static void set_viewport( float x, float y,
  51                           float width, float height,
  52                           float near, float far)
  53 {
  54    float z = far;
  55    float half_width = (float)width / 2.0f;
  56    float half_height = (float)height / 2.0f;
  57    float half_depth = ((float)far - (float)near) / 2.0f;
  58    struct pipe_viewport_state vp;
  59
  60    vp.scale[0] = half_width;
  61    vp.scale[1] = half_height;
  62    vp.scale[2] = half_depth;
  63    vp.scale[3] = 1.0f;
  64
  65    vp.translate[0] = half_width + x;
  66    vp.translate[1] = half_height + y;
  67    vp.translate[2] = half_depth + z;
  68    vp.translate[3] = 0.0f;
  69
  70    ctx->set_viewport_state( ctx, &vp );
  71 }
  72
  73 static void set_vertices( void )
  74 {
  75    struct pipe_vertex_element ve[2];
  76    struct pipe_vertex_buffer vbuf;
  77    void *handle;
  78
  79    memset(ve, 0, sizeof ve);
  80
  81    ve[0].src_offset = Offset(struct vertex, position);
  82    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  83    ve[1].src_offset = Offset(struct vertex, color);
  84    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  85
  86    handle = ctx->create_vertex_elements_state(ctx, 2, ve);
  87    ctx->bind_vertex_elements_state(ctx, handle);
  88
  89
  90    vbuf.stride = sizeof( struct vertex );
  91    vbuf.max_index = sizeof(vertices) / vbuf.stride;
  92    vbuf.buffer_offset = 0;
  93    vbuf.buffer = screen->user_buffer_create(screen,
  94                                             vertices,
  95                                             sizeof(vertices),
  96                                             PIPE_BIND_VERTEX_BUFFER);
  97
  98    ctx->set_vertex_buffers(ctx, 1, &vbuf);
  99 }
 100
 101 static void set_vertex_shader( void )
 102 {
 103    void *handle;
 104    const char *text =
 105       "VERT\n"
 106       "DCL IN[0]\n"
 107       "DCL IN[1]\n"
 108       "DCL OUT[0], POSITION\n"
 109       "DCL OUT[1], COLOR\n"
 110       "  0: MOV OUT[1], IN[1]\n"
 111       "  1: MOV OUT[0], IN[0]\n"
 112       "  2: END\n";
 113
 114    handle = graw_parse_vertex_shader(ctx, text);
 115    ctx->bind_vs_state(ctx, handle);
 116 }
 117
 118 static void set_fragment_shader( void )
 119 {
 120    void *handle;
 121    const char *text =
 122       "FRAG\n"
 123       "DCL IN[0], COLOR, LINEAR\n"
 124       "DCL OUT[0], COLOR\n"
 125       "  0: MOV OUT[0], IN[0]\n"
 126       "  1: END\n";
 127
 128    handle = graw_parse_fragment_shader(ctx, text);
 129    ctx->bind_fs_state(ctx, handle);
 130 }
 131
 132
 133 static void set_geometry_shader( void )
 134 {
 135    void *handle;
 136    const char *text =
 137       "GEOM\n"
 138       "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
 139       "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
 140       "DCL IN[][0], POSITION, CONSTANT\n"
 141       "DCL IN[][1], COLOR, CONSTANT\n"
 142       "DCL OUT[0], POSITION, CONSTANT\n"
 143       "DCL OUT[1], COLOR, CONSTANT\n"
 144       "0:MOV OUT[0], IN[0][0]\n"
 145       "1:MOV OUT[1], IN[0][1]\n"
 146       "2:EMIT\n"
 147       "3:MOV OUT[0], IN[1][0]\n"
 148       "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
 149       "5:EMIT\n"
 150       "6:MOV OUT[0], IN[2][0]\n"
 151       "7:MOV OUT[1], IN[2][1]\n"
 152       "8:EMIT\n"
 153       "9:ENDPRIM\n"
 154       "10:END\n";
 155
 156    handle = graw_parse_geometry_shader(ctx, text);
 157    ctx->bind_gs_state(ctx, handle);
 158 }
 159
 160 static void draw( void )
 161 {
 162    float clear_color[4] = {1,0,1,1};
 163
 164    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 165    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 166    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 167
 168    screen->flush_frontbuffer(screen, surf, window);
 169 }
 170
 171
 172 static void init( void )
 173 {
 174    struct pipe_framebuffer_state fb;
 175    struct pipe_resource *tex, templat;
 176    int i;
 177
 178    /* It's hard to say whether window or screen should be created
 179     * first.  Different environments would prefer one or the other.
 180     *
 181     * Also, no easy way of querying supported formats if the screen
 182     * cannot be created first.
 183     */
 184    for (i = 0;
 185         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 186         i++) {
 187
 188       screen = graw_create_window_and_screen(0,0,300,300,
 189                                              formats[i],
 190                                              &window);
 191    }
 192
 193    ctx = screen->context_create(screen, NULL);
 194    if (ctx == NULL)
 195       exit(3);
 196
 197    templat.target = PIPE_TEXTURE_2D;
 198    templat.format = formats[i];
 199    templat.width0 = WIDTH;
 200    templat.height0 = HEIGHT;
 201    templat.depth0 = 1;
 202    templat.last_level = 0;
 203    templat.nr_samples = 1;
 204    templat.bind = (PIPE_BIND_RENDER_TARGET |
 205                    PIPE_BIND_DISPLAY_TARGET);
 206
 207    tex = screen->resource_create(screen,
 208                                  &templat);
 209    if (tex == NULL)
 210       exit(4);
 211
 212    surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 213                                   PIPE_BIND_RENDER_TARGET |
 214                                   PIPE_BIND_DISPLAY_TARGET);
 215    if (surf == NULL)
 216       exit(5);
 217
 218    memset(&fb, 0, sizeof fb);
 219    fb.nr_cbufs = 1;
 220    fb.width = WIDTH;
 221    fb.height = HEIGHT;
 222    fb.cbufs[0] = surf;
 223
 224    ctx->set_framebuffer_state(ctx, &fb);
 225
 226    {
 227       struct pipe_blend_state blend;
 228       void *handle;
 229       memset(&blend, 0, sizeof blend);
 230       blend.rt[0].colormask = PIPE_MASK_RGBA;
 231       handle = ctx->create_blend_state(ctx, &blend);
 232       ctx->bind_blend_state(ctx, handle);
 233    }
 234
 235    {
 236       struct pipe_depth_stencil_alpha_state depthstencil;
 237       void *handle;
 238       memset(&depthstencil, 0, sizeof depthstencil);
 239       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 240       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 241    }
 242
 243    {
 244       struct pipe_rasterizer_state rasterizer;
 245       void *handle;
 246       memset(&rasterizer, 0, sizeof rasterizer);
 247       rasterizer.cull_face = PIPE_FACE_NONE;
 248       rasterizer.gl_rasterization_rules = 1;
 249       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 250       ctx->bind_rasterizer_state(ctx, handle);
 251    }
 252
 253    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 254    set_vertices();
 255    set_vertex_shader();
 256    set_fragment_shader();
 257    set_geometry_shader();
 258 }
 259
 260
 261 int main( int argc, char *argv[] )
 262 {
 263    init();
 264
 265    graw_set_display_func( draw );
 266    graw_main_loop();
 267    return 0;
 268 }