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 "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 draw( void )
 133 {
 134    float clear_color[4] = {1,0,1,1};
 135
 136    ctx->clear(ctx, PIPE_CLEAR_COLOR, clear_color, 0, 0);
 137    ctx->draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 138    ctx->flush(ctx, PIPE_FLUSH_RENDER_CACHE, NULL);
 139
 140 #if 0
 141    /* At the moment, libgraw leaks out/makes available some of the
 142     * symbols from gallium/auxiliary, including these debug helpers.
 143     * Will eventually want to bless some of these paths, and lock the
 144     * others down so they aren't accessible from test programs.
 145     *
 146     * This currently just happens to work on debug builds - a release
 147     * build will probably fail to link here:
 148     */
 149    debug_dump_surface_bmp(ctx, "result.bmp", surf);
 150 #endif
 151
 152    screen->flush_frontbuffer(screen, surf, window);
 153 }
 154
 155
 156 static void init( void )
 157 {
 158    struct pipe_framebuffer_state fb;
 159    struct pipe_resource *tex, templat;
 160    int i;
 161
 162    /* It's hard to say whether window or screen should be created
 163     * first.  Different environments would prefer one or the other.
 164     *
 165     * Also, no easy way of querying supported formats if the screen
 166     * cannot be created first.
 167     */
 168    for (i = 0;
 169         window == NULL && formats[i] != PIPE_FORMAT_NONE;
 170         i++) {
 171
 172       screen = graw_create_window_and_screen(0,0,300,300,
 173                                              formats[i],
 174                                              &window);
 175    }
 176
 177    ctx = screen->context_create(screen, NULL);
 178    if (ctx == NULL)
 179       exit(3);
 180
 181    templat.target = PIPE_TEXTURE_2D;
 182    templat.format = formats[i];
 183    templat.width0 = WIDTH;
 184    templat.height0 = HEIGHT;
 185    templat.depth0 = 1;
 186    templat.last_level = 0;
 187    templat.nr_samples = 1;
 188    templat.bind = (PIPE_BIND_RENDER_TARGET |
 189                    PIPE_BIND_DISPLAY_TARGET);
 190
 191    tex = screen->resource_create(screen,
 192                                  &templat);
 193    if (tex == NULL)
 194       exit(4);
 195
 196    surf = screen->get_tex_surface(screen, tex, 0, 0, 0,
 197                                   PIPE_BIND_RENDER_TARGET |
 198                                   PIPE_BIND_DISPLAY_TARGET);
 199    if (surf == NULL)
 200       exit(5);
 201
 202    memset(&fb, 0, sizeof fb);
 203    fb.nr_cbufs = 1;
 204    fb.width = WIDTH;
 205    fb.height = HEIGHT;
 206    fb.cbufs[0] = surf;
 207
 208    ctx->set_framebuffer_state(ctx, &fb);
 209
 210    {
 211       struct pipe_blend_state blend;
 212       void *handle;
 213       memset(&blend, 0, sizeof blend);
 214       blend.rt[0].colormask = PIPE_MASK_RGBA;
 215       handle = ctx->create_blend_state(ctx, &blend);
 216       ctx->bind_blend_state(ctx, handle);
 217    }
 218
 219    {
 220       struct pipe_depth_stencil_alpha_state depthstencil;
 221       void *handle;
 222       memset(&depthstencil, 0, sizeof depthstencil);
 223       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 224       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 225    }
 226
 227    {
 228       struct pipe_rasterizer_state rasterizer;
 229       void *handle;
 230       memset(&rasterizer, 0, sizeof rasterizer);
 231       rasterizer.cull_face = PIPE_FACE_NONE;
 232       rasterizer.gl_rasterization_rules = 1;
 233       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 234       ctx->bind_rasterizer_state(ctx, handle);
 235    }
 236
 237    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 238    set_vertices();
 239    set_vertex_shader();
 240    set_fragment_shader();
 241 }
 242
 243
 244 int main( int argc, char *argv[] )
 245 {
 246    init();
 247
 248    graw_set_display_func( draw );
 249    graw_main_loop();
 250    return 0;
 251 }