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 <stdio.h>
   6 #include "state_tracker/graw.h"
   7 #include "pipe/p_screen.h"
   8 #include "pipe/p_context.h"
   9 #include "pipe/p_state.h"
  10 #include "pipe/p_defines.h"
  11
  12 #include "util/u_memory.h"      /* Offset() */
  13 #include "util/u_draw_quad.h"
  14 #include "util/u_inlines.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[4] =
  37 {
  38    { { 0.0f, -0.9f, 0.0f, 1.0f },
  39      { 1.0f, 0.0f, 0.0f, 1.0f }
  40    },
  41    { { -0.9f, 0.9f, 0.0f, 1.0f },
  42      { 0.0f, 1.0f, 0.0f, 1.0f }
  43    },
  44    { { 0.9f, 0.9f, 0.0f, 1.0f },
  45      { 0.0f, 0.0f, 1.0f, 1.0f }
  46    }
  47 };
  48
  49
  50
  51
  52 static void set_viewport( float x, float y,
  53                           float width, float height,
  54                           float near, float far)
  55 {
  56    float z = far;
  57    float half_width = (float)width / 2.0f;
  58    float half_height = (float)height / 2.0f;
  59    float half_depth = ((float)far - (float)near) / 2.0f;
  60    struct pipe_viewport_state vp;
  61
  62    vp.scale[0] = half_width;
  63    vp.scale[1] = half_height;
  64    vp.scale[2] = half_depth;
  65    vp.scale[3] = 1.0f;
  66
  67    vp.translate[0] = half_width + x;
  68    vp.translate[1] = half_height + y;
  69    vp.translate[2] = half_depth + z;
  70    vp.translate[3] = 0.0f;
  71
  72    ctx->set_viewport_state( ctx, &vp );
  73 }
  74
  75 static void set_vertices( void )
  76 {
  77    struct pipe_vertex_element ve[2];
  78    struct pipe_vertex_buffer vbuf;
  79    void *handle;
  80
  81    memset(ve, 0, sizeof ve);
  82
  83    ve[0].src_offset = Offset(struct vertex, position);
  84    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  85    ve[1].src_offset = Offset(struct vertex, color);
  86    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  87
  88    handle = ctx->create_vertex_elements_state(ctx, 2, ve);
  89    ctx->bind_vertex_elements_state(ctx, handle);
  90
  91    memset(&vbuf, 0, sizeof vbuf);
  92
  93    vbuf.stride = sizeof( struct vertex );
  94    vbuf.buffer_offset = 0;
  95    vbuf.buffer = pipe_buffer_create_with_data(ctx,
  96                                               PIPE_BIND_VERTEX_BUFFER,
  97                                               PIPE_USAGE_STATIC,
  98                                               sizeof(vertices),
  99                                               vertices);
 100
 101    ctx->set_vertex_buffers(ctx, 0, 1, &vbuf);
 102 }
 103
 104 static void set_vertex_shader( void )
 105 {
 106    void *handle;
 107    const char *text =
 108       "VERT\n"
 109       "DCL IN[0]\n"
 110       "DCL IN[1]\n"
 111       "DCL OUT[0], POSITION\n"
 112       "DCL OUT[1], COLOR\n"
 113       "  0: MOV OUT[1], IN[1]\n"
 114       "  1: MOV OUT[0], IN[0]\n"
 115       "  2: END\n";
 116
 117    handle = graw_parse_vertex_shader(ctx, text);
 118    ctx->bind_vs_state(ctx, handle);
 119 }
 120
 121 static void set_fragment_shader( void )
 122 {
 123    void *handle;
 124    const char *text =
 125       "FRAG\n"
 126       "DCL IN[0], COLOR, LINEAR\n"
 127       "DCL OUT[0], COLOR\n"
 128       "  0: MOV OUT[0], IN[0]\n"
 129       "  1: END\n";
 130
 131    handle = graw_parse_fragment_shader(ctx, text);
 132    ctx->bind_fs_state(ctx, handle);
 133 }
 134
 135
 136 static void set_geometry_shader( void )
 137 {
 138    void *handle;
 139    const char *text =
 140       "GEOM\n"
 141       "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
 142       "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
 143       "DCL IN[][0], POSITION, CONSTANT\n"
 144       "DCL IN[][1], COLOR, CONSTANT\n"
 145       "DCL OUT[0], POSITION, CONSTANT\n"
 146       "DCL OUT[1], COLOR, CONSTANT\n"
 147       "0:MOV OUT[0], IN[0][0]\n"
 148       "1:MOV OUT[1], IN[0][1]\n"
 149       "2:EMIT\n"
 150       "3:MOV OUT[0], IN[1][0]\n"
 151       "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
 152       "5:EMIT\n"
 153       "6:MOV OUT[0], IN[2][0]\n"
 154       "7:MOV OUT[1], IN[2][1]\n"
 155       "8:EMIT\n"
 156       "9:ENDPRIM\n"
 157       "10:END\n";
 158
 159    handle = graw_parse_geometry_shader(ctx, text);
 160    ctx->bind_gs_state(ctx, handle);
 161 }
 162
 163 static void draw( void )
 164 {
 165    union pipe_color_union clear_color = { {1,0,1,1} };
 166
 167    ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
 168    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 169    ctx->flush(ctx, NULL);
 170
 171    screen->flush_frontbuffer(screen, tex, 0, 0, window);
 172 }
 173
 174
 175 static void init( void )
 176 {
 177    struct pipe_framebuffer_state fb;
 178    struct pipe_resource templat;
 179    struct pipe_surface surf_tmpl;
 180    int i;
 181
 182    /* It's hard to say whether window or screen should be created
 183     * first.  Different environments would prefer one or the other.
 184     *
 185     * Also, no easy way of querying supported formats if the screen
 186     * cannot be created first.
 187     */
 188    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
 189       screen = graw_create_window_and_screen(0, 0, 300, 300,
 190                                              formats[i],
 191                                              &window);
 192       if (window && screen)
 193          break;
 194    }
 195    if (!screen || !window) {
 196       fprintf(stderr, "Unable to create window\n");
 197       exit(1);
 198    }
 199
 200    ctx = screen->context_create(screen, NULL);
 201    if (ctx == NULL)
 202       exit(3);
 203
 204    templat.target = PIPE_TEXTURE_2D;
 205    templat.format = formats[i];
 206    templat.width0 = WIDTH;
 207    templat.height0 = HEIGHT;
 208    templat.depth0 = 1;
 209    templat.array_size = 1;
 210    templat.last_level = 0;
 211    templat.nr_samples = 1;
 212    templat.bind = (PIPE_BIND_RENDER_TARGET |
 213                    PIPE_BIND_DISPLAY_TARGET);
 214
 215    tex = screen->resource_create(screen,
 216                                  &templat);
 217    if (tex == NULL)
 218       exit(4);
 219
 220    surf_tmpl.format = templat.format;
 221    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 222    surf_tmpl.u.tex.level = 0;
 223    surf_tmpl.u.tex.first_layer = 0;
 224    surf_tmpl.u.tex.last_layer = 0;
 225    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
 226    if (surf == NULL)
 227       exit(5);
 228
 229    memset(&fb, 0, sizeof fb);
 230    fb.nr_cbufs = 1;
 231    fb.width = WIDTH;
 232    fb.height = HEIGHT;
 233    fb.cbufs[0] = surf;
 234
 235    ctx->set_framebuffer_state(ctx, &fb);
 236
 237    {
 238       struct pipe_blend_state blend;
 239       void *handle;
 240       memset(&blend, 0, sizeof blend);
 241       blend.rt[0].colormask = PIPE_MASK_RGBA;
 242       handle = ctx->create_blend_state(ctx, &blend);
 243       ctx->bind_blend_state(ctx, handle);
 244    }
 245
 246    {
 247       struct pipe_depth_stencil_alpha_state depthstencil;
 248       void *handle;
 249       memset(&depthstencil, 0, sizeof depthstencil);
 250       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 251       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 252    }
 253
 254    {
 255       struct pipe_rasterizer_state rasterizer;
 256       void *handle;
 257       memset(&rasterizer, 0, sizeof rasterizer);
 258       rasterizer.cull_face = PIPE_FACE_NONE;
 259       rasterizer.gl_rasterization_rules = 1;
 260       rasterizer.depth_clip = 1;
 261       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 262       ctx->bind_rasterizer_state(ctx, handle);
 263    }
 264
 265    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 266    set_vertices();
 267    set_vertex_shader();
 268    set_fragment_shader();
 269    set_geometry_shader();
 270 }
 271
 272
 273 int main( int argc, char *argv[] )
 274 {
 275    init();
 276
 277    graw_set_display_func( draw );
 278    graw_main_loop();
 279    return 0;
 280 }