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