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authorBrian Paul <brian.paul@tungstengraphics.com>2006-08-24 22:03:38 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2006-08-24 22:03:38 +0000
commit94ff996cae9951129fee1010b201b72e8453f406 (patch)
tree3433d9149e0c91e12c19a876b9ad30447b990a06 /src/mesa/drivers/dri
parenta75439093c044301fd54dc42b30d0ee5a475d477 (diff)
Check for NULL program string in r200_translate_vertex_program().
Fixes bug reported by Chris Rankin. Added some new comments.
Diffstat (limited to 'src/mesa/drivers/dri')
-rw-r--r--src/mesa/drivers/dri/r200/r200_vertprog.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/r200/r200_vertprog.c b/src/mesa/drivers/dri/r200/r200_vertprog.c
index 203bce143b..32d0d8eada 100644
--- a/src/mesa/drivers/dri/r200/r200_vertprog.c
+++ b/src/mesa/drivers/dri/r200/r200_vertprog.c
@@ -389,6 +389,12 @@ static unsigned long op_operands(enum prog_opcode opcode)
/* DP4 version seems to trigger some hw peculiarity - fglrx does this on r200 however */
#define PREFER_DP4
+
+/**
+ * Generate an R200 vertex program from Mesa's internal representation.
+ *
+ * \return GL_TRUE for success, GL_FALSE for failure.
+ */
static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
{
struct gl_vertex_program *mesa_vp = &vp->mesa_program;
@@ -401,6 +407,9 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
vp->native = GL_FALSE;
+ if (!mesa_vp->Base.String)
+ return GL_FALSE;
+
if ((mesa_vp->Base.InputsRead &
~(VERT_BIT_POS | VERT_BIT_NORMAL | VERT_BIT_COLOR0 | VERT_BIT_COLOR1 |
VERT_BIT_FOG | VERT_BIT_TEX0 | VERT_BIT_TEX1 | VERT_BIT_TEX2 |
@@ -423,7 +432,8 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
int u_temp_i = R200_VSF_MAX_TEMPS - 1;
struct prog_src_register src[3];
-/* if (getenv("R300_VP_SAFETY")) {
+#if 0
+ if (getenv("R300_VP_SAFETY")) {
WARN_ONCE("R300_VP_SAFETY enabled.\n");
vpi = malloc((mesa_vp->Base.NumInstructions + VSF_MAX_FRAGMENT_TEMPS) * sizeof(struct prog_instruction));
@@ -454,7 +464,9 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
vpi = &mesa_vp->Base.Instructions[mesa_vp->Base.NumInstructions-1];
assert(vpi->Opcode == OPCODE_END);
- }*/
+ }
+#endif
+
/* FIXME: is changing the prog safe to do here? */
if (mesa_vp->IsPositionInvariant) {
struct gl_program_parameter_list *paramList;
@@ -470,6 +482,7 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
vpi = malloc((mesa_vp->Base.NumInstructions + 4) * sizeof(struct prog_instruction));
memset(vpi, 0, 4 * sizeof(struct prog_instruction));
+ /* emit four dot product instructions to do MVP transformation */
for (i=0; i < 4; i++) {
GLint idx;
tokens[3] = tokens[4] = i;
@@ -524,10 +537,13 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
#endif
}
+ /* now append original program after our new instructions */
memcpy(&vpi[i], mesa_vp->Base.Instructions, mesa_vp->Base.NumInstructions * sizeof(struct prog_instruction));
+ /* deallocate original program */
free(mesa_vp->Base.Instructions);
+ /* install new program */
mesa_vp->Base.Instructions = vpi;
mesa_vp->Base.NumInstructions += 4;